Talk:Mechanical advantage - Knowledge (XXG)

729:

is not clear to me. One can say the force is reduced, but given a finite element analysis, will the result be the same? If one takes the case of static equilibrium, one still has to apply F/2 to neutralize one end for the static case, and if you apply less than F/2 the other end will not hold the block in place. Formally this seems different to me, and if the block is falling, the impulses needed to hold it in place will be more than F/2 (virtual work) aEnergy is conserved but the concept of a mechanical advantage is clear in case of the car jack/ self locking mechanism, not in this case. There is no "power advantage" if one considers that one has to apply a force to hold the block in position once lifted (i.e that force is not considered in the calculation of power used, only the lift and the loss/gain of displacement is, but no virtual work is considered for that case). However a horizontal beam on a hinge pushing a large block (overcoming friction) in a horizontal plane may be a better example in this case. -Alok 06:57, 17 August 2011 (UTC)

750:

not the case with the car jack. There is another thing which we assume in case of moments, by saying that in case of a lever the fulcrum is the "pivot" and moments balance around that point. However, consider the limiting case where "we are just overcoming the force", then moments should balance at any point on the lever and pivot mechanism. However if you try to do a "sum forces=0" and "sum moments=0" at one of the "tips" of the lever (considering there is no rotation), the equations are not always solve able. My suggestion as a former student is, that, if the idea is to illustrate the principle, then keep it simple and show locking devices. It is simply an oversight, in my opinion, if one does not consider the fact that there is a "force" needed to hold up the weight in the block and tackle case. A better example would be, say a wheel and ratchet like a fishing rod. Primarily, you are saying no work is done if you consider something "holding" a weight up (or holding torque in case of motors etc) -Alok 06:41, 18 August 2011 (UTC)

806:

slight movement of a system from its equilibrium position. One way to do this is to graphically compute the velocities in the device, and another way is to draw the device in a new configuration very close to the original configuration. Once this is done the principle of virtual work requires that the power, or infinitesimal work, generated by the input force during this movement equal the power, or infinitesimal work, generated by the output force. Because power is the product of force and velocity, equating input and output power yields the ratio of output force to input force, or mechanical advantage, as a ratio of velocities of components in the device. The fact that this speed ratio equals the mechanical advantage is an important result in machine theory.

95: 1165:

and therefore speed of the bicycle. This process changes forces to torque and torque back to forces, so the question of mechanical advantage depends on ratios of forces or torques that are important to the application. The main point of this article is the connection between the velocity ratio associated with the input and output movement of a machine and its mechanical advantage. Machines that do not absorb or dissipate power have a velocity ratio that equals the mechanical advantage. This sets a maximum for the mechanical advantage that can be easily determined from the dimensions and geometry of the machine. I hope this is helpful.

796:

advantage." Mechanical advantage is the gain in output force over the input force, independent of how this input force is generated. Mechanical advantage is a number that characterizes the properties of the device. The mechanical advantage of a lever, gear train or block and tackle remains the same whether an individual applies the input force or another mechanical component such as a winch with the ratchet and paw locking system applies the input force. In particular, the mechanical advantage of a block and tackle system is the same whether a person holds the rope to support the load, or that rope is tied down to a railing.

1039:

all of these topics. This is the reason that I now take the time to try to make the various articles on machines match more closely to our current understanding, but in a way that works to preserve the structure of the original article. In the process of doing this, I have been surprised by the number of people who vandalize articles, probably not with malice but because it is easy. But also, I have been amazed at how quickly others are ready to identify the vandalism and correct it. As with many things, it is the community that supports an organization that is its true strength.

31: 347:. In such an assembly the use of 'pistons' seems irrelevant if the emphasis is on the external connections in the light of this article: anything outside the piston is mechanical and is covered in the article. If the increase in force (in other words 'advantage') is principally due to the internals and sizing of parts of the piston can one then still use the term 'mechanical advantage'? That depends on how you break down the working principle of the pistons, etc.. 1117:

with the hierarchy. In particular, I think this article should appear in both the introductory physics and mechanical engineering categories, but this forces either introductory physics to be under mechanical engineering or mechanical engineering to be under introductory physics. I have now done this both ways, and will switch it again if others prefer. However, I feel it is a small price to pay to ensure this article appears in both categories.

694:

teachers study the lever using work, which in some ways parallels the analysis by Archimedes. The problem is that the correct analysis is based on virtual work, which introduces virtual displacements, which are best considered to be velocity that occurs over a virtual moment of time. The use of power is not familiar at the elementary level, but I believe it is important because it is critical to understanding the basic principles of machines.

85: 200: 64: 190: 169: 785:

sustain the static equilibrium but this is not accounted a "work" done is unclear to me. (The lever example above is specific to the cantilever case, but then perhaps one would break it down to a pivot near one end and balance out everything.)It took me a while to digest it, and hence I suggested it is better we stick to simpler cases of self locking mechanisms to illustrate the MA cases.

22: 1937: 1896: 734:

includes the friction of a rope wrapped around a shaft will have a similar self-locking feature. Static equilibrium requires an input force to balance the output force in levers, gear trains, and block and tackle systems. Mechanical advantage where the input force is less than the output force derives from the geometric design of these devices.

763:

input force to balance the output force, and none need have a ratchet and pawl to lock the system. While I am not sure I understand your concerns, one issue may be that if the system is static, such as when you "hold" the system so it does not move, there is no power flow or work done. The essential idea of the principle

1116:

I have tried to collect some of the articles on machines into the hierarchy of categories Mechanical engineering, Machines, Kinematics, Mechanisms, and Linkages. Some articles like this one on Mechanical advantage are important enough to appear in a number of broad categories, which causes problems

1038:

I am new to Knowledge (XXG), but I know that most of my students use Knowledge (XXG) to get a general introduction to new things, including machines and mechanisms. It is also clear that my students are not alone in this, because Knowledge (XXG) comes up as the first entry in a Google search on most

749:

If a block and tackle adds friction which can handle the "F/2" and is self locking, then most likely it will be no MA in that case, because that same friction has to be overcome when pulling the block. There is no MA if you consider that someone still has to apply an F/2 to hold up the block. This is

1164:

Phvan, thank you for the note but we do not have to distinguish between the force and torque ratios. These can be calculated as needed. One of the main uses for machines is to amplify forces and movement. The slow rotation of the pedals on a bicycle transforms into fast rotation of the rear wheel

1054:

Hi Prof McCarthy. You now have over 2000 edits so there is no need to say you are new to Knowledge (XXG). You are one of the more experienced editors! I agree that vandalism, mischief and experimentation are a source of annoyance, and I do my fair share of reverting of such things. The strongest

1018:

Hi all, I find this very interesting, I've read this quickly and I wonder if Alok could explain why self locking is relevant. I am new to Knowledge (XXG) editing, (this is my second contribution). I am an engineer and take mechanical advantage for granted in a very practical sense. MA is force in vs

858:

I am sorry but I do not understand how a "small twist of a knob," "car accelerator," and "holding up a bag" combine to be "better illustrated there." This discussion is on the technical definition of mechanical advantage based on the principle of virtual work with examples provided by levers, gear

826:

If you are going with the assumption that "energy is conserved", or the del.(del(energy)) is zero equivalent, then obviously virtual work will give you the desired results. By your logic a electrically/mechanically controlled lever where you input a small twist of a knob giving a large output (say a

805:

The analysis of mechanical advantage of levers, gears and block and tackle systems is at the core of machine theory, and is attributed to Archimedes, who is said to have used essentially the same ideas as the modern theory of virtual work. The principle of virtual work requires visualizing the very

795:

Thank you for taking the time to ask these questions. I believe I understand your view that a machine that locks itself in place has advantages over a machine that needs a person to apply the input force to hold it. Please understand that this advantage is not what is meant by the term "mechanical

728:

Take the case of a car jack, the car jack inherently has the ability to hold the vehicle up which is why mechanical advantage is in it's favor. However in case of the block and tackle/pulley, there is no inherent "holding" mechanism provided. In other words, how is this giving a mechanical advantage

1426:

A recent revision to this article defines mechanical advantage as "how much easier work is." This is simply not correct. The best performing machine does not dissipate power, which means the power in equals the power out, so over time the work in and work out are the same. There is no reduction,

1255:

With regard to my own opinion, I am not competent to discuss the content of the graphic, I am competent to say that its position prior to removal was incorrect. Assuming the contents to be technically correct, and only then, I have no objection to its placement in a less prominent, correct position

733:

Mechanical advantage calculations are based on the principle of virtual work which considers the flow of power through the device. A self-locking scissor jack has enough mechanical advantage to amplify the frictional forces in the drive screw and support the load. A block and tackle that includes

1251:

I note that the image in question was removed and that removal subsequently reverted, though with a rather awkward edit summary. I have reverted the reversion and the article (as I post this) has the bicycle graphic not present. I suggest that the inclusion of, the content of, and the placement of

984:

am I changing the subject? Or are you trying to? I have simply stated that the article is biased because archimedes etc wrote a lever law and did not tie it to work done. The prof is caught up in the dictum of prior art on this subject and I have stated my reasons why he is wrong... You seem to be

784:

All I am asking is , does the fact that someone apply a force to hold a block up against gravity imply no work is done (the block is in static equilibrium). This bit is not clear to me in the block and tackle case, but is clear in "self locking" cases. The fact that an individual has to apply F to

423:

for example, is not and should not be part of the article on Mechanical Advantage, even though a wrench is just a lever used to exert mechanical advantage on something. A device, and the theory which it operates on, deserve separate articles. I am removing the redirect for 'torque multiplier' to

340:

One guiding principle is, I think, what is common practice in education and industry. It is my experience that in those environments one does not speak in terms of 'mechanical advantage' when discussing hydraulic and pneumatic systems. But of course I may be wrong since I do not know all fields of

1992:

Your arm is a third-class lever. It is this lever action that makes it possible for you to flex your arms so quickly. Your elbow is the fulcrum. Your biceps muscle, which ties onto your forearm about an inch below the elbow, applies the effort; your hand is the resistance, located about 18 inches

278:

There must be a better translation of the term "mechanical advantage" than "Übersetzung" or "Übersetzungsverhältnis" which I have given. But even as a German and mechanical engineer I don't know. The German page where I have linked to, talks only about gear ratio. The leo translation "Hebelarm"

762:

at the other end, is much less if the fulcrum is close to the heavy load and far from the input force. The ratio of the output force to the input force is the mechanical advantage. A similar relationship arises in the analysis of gearing and a block and tackle. All of these systems require an

1482:

Suppose L is load, F is fulcrum and E is effort then LF must represent the distance from the point of application of the load to the fulcrum and EF is similarly the distance from the point of application of the effort to the fulcrum. However, this same statement is made with the figure and the

908:

Your concern seems to be the physical effort that one must expend to hold something, which is separate from the mechanical advantage of the device the person may be holding. It is for this reason that self-locking is not part of the definition of mechanical advantage, and self-locking does not

693:

Your edits were very helpful. I tried to include all of them in the actual article. If I missed any it was an error. Thank you very much. Regarding the use of moments rather than velocity to study the lever, I truly understand your point. However, many if not most elementary school science

1294:

Someone might be able to add it into the article sympathetically (after correcting the direction of the output force if we reach consensus on that). I'm happy for anyone to try (hint: there is a bicycle example already). Just dumping it into the opening section as was done does not improve the

482:. In many cases a combination of approaches are used, so that a final burton is used to multiply the advantage of an additive tackle. A variation that uses slipping points of purchase to get a longer overall range of motion (called a Z hitch, I believe) is taught for some rescue situations. 1643:

Consider the 18-speed bicycle with 7 in (radius) cranks and 26 in (diameter) wheels. If the sprockets at the crank and at the rear drive wheel are the same size, then the ratio of the output force on the tire to the input force on the pedal can be calculated from the law of the lever to be

1867:

This is quite interesting, it is common to calculate gearing for bicycles simple in relation to the gears, while ignoring the crank length or the wheel size, not very correct, but common. This website has information that is relevant but perhaps best put in an area specifically about

708:

I have added a section on a block and tackle. This case really benefits from using virtual work because of the relationship between the velocity of the rope versus the velocity of the moving block is clearly seen to be the number of rope sections supporting the moving block.

2087:

Sure. "Rigid body" is completely rigid so you don't have to clarify. My only worry is that someone who doesn't click on the link might be just assuming that its a finitely rigid body made out of something like steel. But its not too much misinformation to worry about.

1555:

The third sentence took me a long time to get to after puzzling the second (i. e., because of the false scent), but finally it lights the way out: the second sentence is in apposition to (and apprehension of) this third one on how we measure friction belt drives.

1989:

This rule—mechanical advantage equals resistance divided by effort —applies to all machines A second class lever's mechanical advantage islike a first class lever's in that the distances are measured from the fulcrum and the MA is greater than 1.

1215:

Finally, why is the output force shown as acting on the road? The output from this machine is a force on the bicycle (leading to motion of the bicycle). The diagram shown would make sense if the rear tyre was being used to drive a connveyor belt.

1552:(I came to this article for the first time, browsing). I was just told about the input sprocket and output sprocket: now, which is "the sprocket"? And what sort of mechanism was I reading about before, if now I am to be told about toothed belts? 767:

is that movement away from this static situation will result in power generated by the input and output forces that must cancel, and this principle provides a simple way to determine the mechanical advantage of the system. I hope this helps.

909:

affect the analysis of machines such as levers, gear trains and block and tackle systems. It is not appropriate to confine anything in this article to self locking cases, because self-locking is not relevant to the topic of this article.

296:

I was trying to understand this and was having a difficult time mentally picturing the various pulley systems described. I think some simple illustrations, in the form of diagrams, would be greatly beneficial for readers of this article.

1290:

Not sure that matters at all :). Let's now reach a consensus over this item. Do I take it from your removal that you see no position for it anywhere in the article, or simply that you removed it pending thinking where it might be placed?

827:

car accelerator) is also giving a mechanical advantage, but that is not the case, right? If that be the case, typically someone holding a bag up, is not doing any work :). I am just saying that the concept is better illustrated there.

1986:

It's easy to find sites with a mechanical advantage formula for 1st class levers, but it is not immediately obvious how to find mechanical advantage for 2nd and third class levers, other than 3rd class levers MA is less than one.

279:

does also not really fit to this page. Maybe German does not distinguish between "mechanical advantage" and "gear ratio", like english does not distinguish between "steuern" and "regeln" (it is both called "control" in English).

329:

How about mentioning hydraulic and pneumatic systems? Just as with the lever, it is possible to assemble combinations of pistons and connecting rods that multiply force at the expense of having to move more fluid or gas.

1847: 500:

Jim, I agree with you. You are free to create a new sub-section and add some explanatory text about the burton configuration. You can use the Wesleyan.edu website as an in-line citation to support your new sub-section.

1211:

Also I find it a little perverse when the first example of mechanical advantage has a mechanical disadvantage. Of course I realise that you can talk about a mechanical advantage of 0.3, but for the first example??

1713: 2158: 2113:

As far as explaining a rigid body, for those who are not familiar with the idealization we already explicitly say that it does not deflect. That's an absolute. It really, really, really does not deflect.

2067:

is an idealized object in engineering or physics which does not (cannot) deform or deflect. Please stop adding the redundant "completely". There's no need to say a "completely" rigid body, it's simply a

1309:

The more I look at the diagram the less I like it. If it's meant to be a free body diagram then the wheel and crank are about to disappear off the page downwards and to the left, which might surprise the

35: 1019:

force out or distance in vs distance out. since energy is the same on both sides (force x distance) both methods tell me what I need to know. I apologize if I am dragging up a heated debate.

419:

A 'torque multiplier' is a specific type of tool. It does use mechanical advantage to multiply the torque, however, it being merged with this article does not make sense. The article for

2148: 1762: 1948: 1720:

The calculated value of 0.54 here is referring to the crank-wheel ratio and not to the MA value. In fact the MA value of the sprockets is one, since the sprockets are the same size.

1477: 580:

Hello Prof McCarthy. You are most welcome to make revisions to this article, and any other Knowledge (XXG) article. No special approval or permission is required. Happy editing!

462:. The trade-off is that the pulleys meet after the load has moved only part of the way to the fixed block. This is not always a fatal disadvantage, because the load does not always 1566:

between sentences from "toothed belt drive" to "friction belt drives", which is not ideal in apposition; "radius" should be "radii"; and "can be" and "must be" are not equivalent.

2163: 2178: 1136:

Hi I do not know much about the term "mechanical advantage" but clearly two gears interlocked cannot change the force ratio. We need to distinguish between T1/T2 and F1/F2.

967:

Then why do you want to re-edit the article, it was fine in it's original form. Or do you think because he writes "Prof" there he is right? -Alok 08:57, 26 August 2011 (UTC)

927:

If you are merely stating what is already prior art, or relevant literature on the topic, edits do not make sense. I am stating that self locking is relevant to the topic.

404:

A torque multiplier is a specific type of mechanical advantage that is already discussed in this article. As such, it only makes sense for the two article to be merged.

151: 2007:

Can't this be simplified by appealing to a balance of torque argument rather than the current argument involving power and velocity? The Torques are balanced when F

1364:

Should the diagram depict a stationary or dynamic situation? ie the difference between some work being done, versus a static balance. Does it matter? I don't know.

1070:. There are other tools, one for each particular problem. If you ever feel the need for a particular tool but can't find it, don't hesitate to ask me, or ask at 256: 1559:

But it is no use to say "the third sentence makes it clear." I stopped at the second, retraced and reread several times in case I had misunderstood something.

2188: 246: 2143: 941:

Hmm, you are entitled to your opinion. But I think the Prof is right: "self-locking is not relevant to the topic of this article" as per its definition. --

667: 1993:

from the fulcrum. In the split second it takes your biceps muscle to contract an inch, your hand has moved through an 18-inch arc. MA = 1/18 (less than 1)

1276:

Just to confirm it was me that removed it. Knowledge (XXG) logged me out whilst I was doing the edit. I'm always more than happy to discuss my edits :)

454:

It is possible to obtain much greater mechanical advantage with only single pulleys using this approach because the overall mechanical advantage is the

651:

I did not delete the discussion of IMA and AMA, and relabeled the section efficiency. While it is an awkward explanation, I do not think it is wrong.

2193: 222: 2173: 1639:

There seems to be a mistake in the example of the bicycle chain drive (or at least, the wording is strange in my opinion). It states the following:

1233:

Your point is persuasive. I suspect it may simply be an incorrectly positioned picture. I'm not commenting on the technical aspects of the diagram.

141: 1183:

Following your argument, would you say that the diagram of the lever should reflect a dynamic situation rather than simply two weights in balance?

2153: 1770: 1544:

drive, the number of teeth on the sprocket can be used. For friction belt drives the pitch radius of the input and output pulleys must be used."

619: 94: 2183: 1349:

I would prefer to see a dagram showing a human effort lifting a weight, is that wp:POV though (I have a fetish for machines lifting weights)

1930: 117: 213: 174: 1408: 2095: 2048: 2034:

Why does it say "does not deflect" in the first overview or whatever its called section? I would think the ideal mechanism "does not

1059:. You probably have at least a few articles on your Watchlist, but if not, and you aren't familiar with how it works have a look at 970:

I have no interest in re-editing this article at this time. You are free to do that if you want. Why are you changing the subject? --

2168: 1952: 1614:

This wouldn't matter in a more-technical article, but this one is (I presume) aimed at a general audience. I would normally just be

1649: 1427:

or easing, in the amount of power or work. Furthermore, without any explanation it is impossible to make sense of the equation.

1980:, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section. 478:. This achieves a greater advantage in this critical line with less weight aloft; it allows a sufficient range of motion in the 108: 69: 2138: 44: 1911: 1001: 899: 849: 466:

to move all the way, and there are common uses of this approach to achieving mechanical advantage. See, for instance the

1152: 444:

There is a whole separate approach to using pulleys to obtain mechanical advantage that needs to be addressed here.

1903: 666:

I have reviewed your draft and made my suggested changes. I have left some remarks on the Discussion page - see

349:

What you are suggesting should be broken down into the elementary parts related to forces and change in forces.

603:

I will make the changes in a draft on my personal page for others to examine before I post them to this page.

373:

Another one I am thinking of is the use of explosives to create deformation in (large) sheets of metal. Or in

50: 1488: 1412: 1380:

No-one else have any comment? Ok. I will draw a force lifting a weight with forces Fa,Fb and distances a,b.

1170: 1122: 1102: 1044: 914: 864: 811: 773: 739: 714: 699: 656: 642: 628: 608: 570: 2091: 2044: 1726: 1404: 1140: 989: 887: 837: 2099: 2052: 313: 1433: 1060: 565:

If it is all right, I would like to make some revisions to this article to clarify the basic principles.

1956: 221:

on Knowledge (XXG). If you would like to participate, please visit the project page, where you can join

116:

on Knowledge (XXG). If you would like to participate, please visit the project page, where you can join

1910:, which currently points to this page. If you would like to participate in the discussion, please see 359:

does show a formula, but could do with more explanation. Also pictures are still missing. Articles on

1919: 1855: 1505: 1148: 975: 946: 534: 386: 1548:

The language here confused me— particularly I think the sentence starting "For a toothed belt" lays

21: 2020: 1625: 1388: 1369: 1354: 1315: 1300: 1281: 1223: 1188: 1084: 993: 891: 841: 680: 590: 510: 409: 290: 1252:

that graphic now becomes a matter for talk page discussion and consensus prior to any reinsertion.

1881: 1563: 1484: 1261: 1238: 1166: 1118: 1098: 1040: 1024: 997: 910: 895: 860: 845: 807: 769: 735: 710: 695: 652: 638: 624: 604: 566: 356: 352: 205: 1851: 1144: 1208:

I think the bicycle is a bit too complex. The lever would seem the perfect example to analyse.

754:

I am sorry that this is not clear. I will try again with a simpler example. The input force F

398: 308: 1615: 448: 377:. That does not fit in this article (but in a separate article?) but is related to the idea. 367:

should also be expanded with information on the force distribution and transfer. The article

2119: 2077: 471: 467: 429: 331: 298: 1977: 1071: 1067: 1915: 1501: 971: 942: 623:. I think I cover all the points in this article with a little more precision and depth. 530: 382: 364: 360: 2110:

If you understand rigid bodies why did you suggest that we change "deflect" to "defect"?

2016: 1621: 1384: 1365: 1350: 1311: 1296: 1277: 1219: 1184: 1075: 671: 581: 550: 502: 490: 479: 405: 100: 199: 2132: 1877: 1381: 1257: 1234: 1020: 1999:

Last edited at 19:38, 18 May 2011 (UTC). Substituted at 23:35, 29 April 2016 (UTC)

1574: 1541: 764: 1346:

at least it has forces but it's not clear what is the input and what the output.

1337: 877:

My point is that the illustrations should be confined to self locking cases only.

2115: 2073: 1549: 425: 368: 218: 84: 63: 2123: 2103: 2081: 2056: 2024: 1960: 1923: 1885: 1859: 1629: 1509: 1492: 1416: 1392: 1373: 1358: 1319: 1304: 1285: 1265: 1242: 1227: 1192: 1174: 1156: 1126: 1106: 1091: 1048: 1028: 979: 950: 918: 868: 815: 777: 743: 718: 703: 687: 660: 646: 632: 612: 597: 574: 554: 538: 518: 494: 433: 413: 390: 334: 318: 301: 189: 168: 2069: 2064: 475: 195: 90: 1842:{\displaystyle MA={\frac {F_{b}}{F_{a}}}={\frac {a}{b}}={\frac {7}{13}}=0.54} 637:

Rather than cut and past the entire article. I will move it in in sections.

546: 486: 1522:

In the section "Chain and Belt Drives", under the second equation we have:

345:"assemble combinations of pistons and connecting rods that multiply force" 1907: 1936: 1895: 1343: 859:

trains and block and tackle systems. You seem to have other concerns.

379:(I know I am rambling. I hope I make myself clear... It is still early.) 355:

alas has no explanation in that area, while it should have. The article

1944: 1055:

weapon in our fight against damage to articles we know and love is the

617:

Please see the revised version of this article that I have prepared at

374: 113: 526: 420: 1874: 2038:," "not does not deflect." Also, the gear GIF seems kinda jerky. 2003:

Appeal to "zero sum or torques" rather than the velocity argument

2015:

b and from that we calculate the mechanical advantage as a/b. --

1723:

I would suggest to replace MA with crank-wheel ratio and remove

1382:

http://commons.wikimedia.org/File:Lever_mechanical_advantage.png

985:

trying to make it personal. -Alok 12:00, 26 August 2011 (UTC)

1708:{\displaystyle MA={\frac {F_{B}}{F_{A}}}={\frac {7}{13}}=0.54} 1635:

Slightly confusing terminology in Example: bicycle chain drive

15: 1943:

An editor has asked for a discussion to address the redirect

1935: 1894: 2159:

Knowledge (XXG) level-5 vital articles in Physical sciences

1912:

Talk:Leverage (disambiguation)#Requested move 19 March 2015

1618:, but I am a little wary that I may have missed something. 1500:

If it is not correct then it should not be there, right? --

1205:

Is a bicycle the best example to use to open the article?

1097:

Thank you. This is very helpful. Great work by the way.

449:

http://www.wesleyan.edu/physics/demos/mechanic/1m2010.html

1066:

For persistent vandals there are stronger tools, such as

545:

Yes, thanks. And there is already an article about it! --

1132:

Distinguish between torque advantage and force advantage

758:

required at one end of a lever to support a heavy load F

1972: 2072:. I'll add the link to the article to clarify things. 1540:

is the number of teeth on the output sprocket. For a

1773: 1729: 1652: 1436: 217:, a collaborative effort to improve the coverage of 112:, a collaborative effort to improve the coverage of 2149:

Knowledge (XXG) vital articles in Physical sciences

2041:Talk page section saved about noon, aug 11, 2016. 1344:

http://es.wikipedia.org/Archivo:LeverPrincleple.svg

1338:

http://en.wikipedia.org/File:Lever_Principle_3D.png

458:of the individual advantages instead of simply the 1841: 1756: 1707: 1471: 1584:is the number of teeth on the input sprocket and 1533:is the number of teeth on the input sprocket and 1902:I have proposed to move the disambiguation page 470:. A "Spanish Burton" is typically rigged in the 1976:, and are posted here for posterity. Following 1518:False scent in "Chain and Belt Drives" section 1891:Move request affecting a redirect to this page 1591:is the number of teeth on the output sprocket. 1569:May I suggest a simplification such as this?: 1336:The current lever diagram needs some forces! 371:could be expanded a lot to cover these areas. 1970:The comment(s) below were originally left at 8: 1767:Alternatively, change the equation to this: 1562:Less importantly, there is also a change of 2164:C-Class vital articles in Physical sciences 1034:Weaknesses and strengths of Knowledge (XXG) 668:User talk:Prof McCarthy/mechanicaladvantage 451:for an illustration of the two approaches. 2179:C-Class physics articles of Mid-importance 2089: 2042: 163: 58: 1823: 1810: 1799: 1789: 1783: 1772: 1746: 1736: 1730: 1728: 1689: 1678: 1668: 1662: 1651: 1446: 1435: 724:not sure about the block and tackle case 231:Knowledge (XXG):WikiProject Engineering 165: 60: 19: 2144:Knowledge (XXG) level-5 vital articles 1757:{\displaystyle {\frac {F_{B}}{F_{A}}}} 1603:is the radius of the input pulley and 525:Jim, I believe you're talking about a 1951:if you have not already done so. -- 7: 1472:{\displaystyle MA={\frac {LF}{EF}}.} 440:pulleys used in burton configuration 211:This article is within the scope of 106:This article is within the scope of 2189:Mid-importance Engineering articles 1610:is the radius of the output pulley. 883:-Alok 08:51, 25 August 2011 (UTC) 833:-Alok 07:29, 24 August 2011 (UTC) 126:Knowledge (XXG):WikiProject Physics 49:It is of interest to the following 1973:Talk:Mechanical advantage/Comments 933:-Alok 07:12, 26 August 2011 (UTC) 789:-Alok 05:09, 23 August 2011 (UTC) 14: 1978:several discussions in past years 1875:http://sheldonbrown.com/gain.html 2194:WikiProject Engineering articles 234:Template:WikiProject Engineering 198: 188: 167: 93: 83: 62: 29: 20: 2174:Mid-importance physics articles 325:Hydraulic and pneumatic systems 251:This article has been rated as 146:This article has been rated as 2154:C-Class level-5 vital articles 1860:10:50, 12 September 2013 (UTC) 1630:20:43, 11 September 2013 (UTC) 1: 1510:08:39, 30 November 2012 (UTC) 1493:20:57, 27 November 2012 (UTC) 1417:16:38, 3 September 2012 (UTC) 1175:06:50, 15 February 2012 (UTC) 1157:21:09, 14 February 2012 (UTC) 1107:06:01, 2 September 2011 (UTC) 1092:02:21, 2 September 2011 (UTC) 1049:21:03, 1 September 2011 (UTC) 351:Relevant is that the article 225:and see a list of open tasks. 120:and see a list of open tasks. 2184:C-Class Engineering articles 1886:23:52, 7 December 2013 (UTC) 1127:15:45, 14 October 2011 (UTC) 1029:00:06, 8 December 2013 (UTC) 391:09:36, 18 October 2008 (UTC) 335:21:04, 17 October 2008 (UTC) 129:Template:WikiProject Physics 2124:17:49, 11 August 2016 (UTC) 2104:17:35, 11 August 2016 (UTC) 2082:17:02, 11 August 2016 (UTC) 2063:It's correct as written. A 2057:15:45, 11 August 2016 (UTC) 1596:For a friction belt drive, 1407:redirect here at present. 980:09:32, 26 August 2011 (UTC) 951:08:25, 26 August 2011 (UTC) 919:11:22, 25 August 2011 (UTC) 869:11:02, 24 August 2011 (UTC) 816:16:14, 23 August 2011 (UTC) 778:13:06, 18 August 2011 (UTC) 744:15:48, 17 August 2011 (UTC) 476:square rigged sailing ships 2210: 1961:21:15, 21 March 2015 (UTC) 1924:19:17, 19 March 2015 (UTC) 620:mechanical advantage draft 555:18:08, 18 April 2010 (UTC) 539:16:16, 18 April 2010 (UTC) 519:05:18, 18 April 2010 (UTC) 495:02:35, 18 April 2010 (UTC) 434:16:54, 27 March 2013 (UTC) 319:12:41, 2 August 2008 (UTC) 257:project's importance scale 152:project's importance scale 1985: 1904:Leverage (disambiguation) 1483:paragraph that follows. 1393:19:21, 27 July 2012 (UTC) 1374:11:31, 11 July 2012 (UTC) 1359:10:52, 11 July 2012 (UTC) 1320:10:37, 11 July 2012 (UTC) 1305:10:13, 11 July 2012 (UTC) 1286:08:48, 11 July 2012 (UTC) 1266:07:36, 11 July 2012 (UTC) 1243:19:10, 10 July 2012 (UTC) 1228:12:48, 10 July 2012 (UTC) 1193:11:24, 11 July 2012 (UTC) 719:06:18, 25 July 2011 (UTC) 561:Revisions to this article 302:20:25, 23 July 2006 (UTC) 250: 183: 145: 78: 57: 2169:C-Class physics articles 2025:01:15, 4 June 2016 (UTC) 1947:. Please participate in 1931:Redirects for discussion 704:05:28, 7 July 2011 (UTC) 688:03:36, 7 July 2011 (UTC) 661:13:04, 6 July 2011 (UTC) 647:12:40, 6 July 2011 (UTC) 633:04:39, 6 July 2011 (UTC) 613:03:13, 5 July 2011 (UTC) 598:01:15, 5 July 2011 (UTC) 575:00:45, 5 July 2011 (UTC) 1949:the redirect discussion 414:18:15, 7 May 2009 (UTC) 214:WikiProject Engineering 2139:C-Class vital articles 1940: 1899: 1843: 1758: 1709: 1473: 307:A diagram was added -- 1939: 1898: 1844: 1759: 1710: 1474: 1405:leverage (mechanical) 43:on Knowledge (XXG)'s 36:level-5 vital article 1771: 1727: 1650: 1434: 1201:Best opening example 397:Proposed merge from 237:Engineering articles 1764:from the equation. 109:WikiProject Physics 1966:Assessment comment 1941: 1929:Gearing listed at 1906:over the redirect 1900: 1839: 1754: 1705: 1564:grammatical number 1469: 357:Pneumatic cylinder 353:Hydraulic cylinder 274:German translation 206:Engineering portal 45:content assessment 2106: 2094:comment added by 2059: 2047:comment added by 1997: 1996: 1831: 1818: 1805: 1752: 1697: 1684: 1464: 1403:I recommend that 1342:This is better: 1160: 1143:comment added by 1006: 992:comment added by 904: 890:comment added by 854: 840:comment added by 399:Torque multiplier 380: 317: 271: 270: 267: 266: 263: 262: 162: 161: 158: 157: 2201: 1983: 1982: 1975: 1848: 1846: 1845: 1840: 1832: 1824: 1819: 1811: 1806: 1804: 1803: 1794: 1793: 1784: 1763: 1761: 1760: 1755: 1753: 1751: 1750: 1741: 1740: 1731: 1714: 1712: 1711: 1706: 1698: 1690: 1685: 1683: 1682: 1673: 1672: 1663: 1573:"For a chain or 1478: 1476: 1475: 1470: 1465: 1463: 1455: 1447: 1422:Law of the lever 1256:in the article. 1159: 1137: 1087: 1080: 1005: 986: 903: 884: 853: 834: 683: 676: 593: 586: 515: 507: 378: 311: 295: 289: 239: 238: 235: 232: 229: 208: 203: 202: 192: 185: 184: 179: 171: 164: 134: 133: 132:physics articles 130: 127: 124: 103: 98: 97: 87: 80: 79: 74: 66: 59: 42: 33: 32: 25: 24: 16: 2209: 2208: 2204: 2203: 2202: 2200: 2199: 2198: 2129: 2128: 2032: 2014: 2010: 2005: 1971: 1968: 1934: 1893: 1795: 1785: 1769: 1768: 1742: 1732: 1725: 1724: 1674: 1664: 1648: 1647: 1637: 1608: 1601: 1589: 1582: 1538: 1531: 1520: 1456: 1448: 1432: 1431: 1424: 1401: 1334: 1203: 1138: 1134: 1114: 1085: 1076: 1036: 987: 885: 835: 761: 757: 726: 681: 672: 591: 582: 563: 511: 503: 468:Trucker's hitch 442: 402: 365:Pneumatic motor 361:Hydraulic motor 327: 293: 287: 285: 276: 236: 233: 230: 227: 226: 204: 197: 177: 131: 128: 125: 122: 121: 99: 92: 72: 40: 30: 12: 11: 5: 2207: 2205: 2197: 2196: 2191: 2186: 2181: 2176: 2171: 2166: 2161: 2156: 2151: 2146: 2141: 2131: 2130: 2127: 2126: 2111: 2085: 2084: 2031: 2030:Deflect/Defect 2028: 2012: 2008: 2004: 2001: 1995: 1994: 1967: 1964: 1933: 1927: 1892: 1889: 1872: 1871: 1870: 1869: 1838: 1835: 1830: 1827: 1822: 1817: 1814: 1809: 1802: 1798: 1792: 1788: 1782: 1779: 1776: 1749: 1745: 1739: 1735: 1718: 1717: 1716: 1715: 1704: 1701: 1696: 1693: 1688: 1681: 1677: 1671: 1667: 1661: 1658: 1655: 1636: 1633: 1612: 1611: 1606: 1599: 1593: 1592: 1587: 1580: 1546: 1545: 1536: 1529: 1519: 1516: 1515: 1514: 1513: 1512: 1480: 1479: 1468: 1462: 1459: 1454: 1451: 1445: 1442: 1439: 1423: 1420: 1400: 1397: 1396: 1395: 1377: 1376: 1333: 1330: 1329: 1328: 1327: 1326: 1325: 1324: 1323: 1322: 1307: 1271: 1270: 1269: 1268: 1253: 1246: 1245: 1202: 1199: 1198: 1197: 1196: 1195: 1178: 1177: 1133: 1130: 1113: 1110: 1095: 1094: 1064: 1035: 1032: 1016: 1015: 1014: 1013: 1012: 1011: 1010: 1009: 1008: 1007: 982: 958: 957: 956: 955: 954: 953: 931: 930: 929: 928: 922: 921: 881: 880: 879: 878: 872: 871: 831: 830: 829: 828: 821: 820: 819: 818: 800: 799: 798: 797: 787: 786: 781: 780: 759: 755: 747: 746: 725: 722: 691: 690: 601: 600: 562: 559: 558: 557: 542: 541: 522: 521: 441: 438: 437: 436: 424:this article. 401: 395: 394: 393: 372: 350: 348: 342: 326: 323: 322: 321: 284: 281: 275: 272: 269: 268: 265: 264: 261: 260: 253:Mid-importance 249: 243: 242: 240: 223:the discussion 210: 209: 193: 181: 180: 178:Mid‑importance 172: 160: 159: 156: 155: 148:Mid-importance 144: 138: 137: 135: 118:the discussion 105: 104: 101:Physics portal 88: 76: 75: 73:Mid‑importance 67: 55: 54: 48: 26: 13: 10: 9: 6: 4: 3: 2: 2206: 2195: 2192: 2190: 2187: 2185: 2182: 2180: 2177: 2175: 2172: 2170: 2167: 2165: 2162: 2160: 2157: 2155: 2152: 2150: 2147: 2145: 2142: 2140: 2137: 2136: 2134: 2125: 2121: 2117: 2112: 2109: 2108: 2107: 2105: 2101: 2097: 2093: 2083: 2079: 2075: 2071: 2066: 2062: 2061: 2060: 2058: 2054: 2050: 2046: 2039: 2037: 2029: 2027: 2026: 2022: 2018: 2002: 2000: 1991: 1984: 1981: 1979: 1974: 1965: 1963: 1962: 1958: 1954: 1950: 1946: 1938: 1932: 1928: 1926: 1925: 1921: 1917: 1913: 1909: 1905: 1897: 1890: 1888: 1887: 1883: 1879: 1876: 1866: 1865: 1864: 1863: 1862: 1861: 1857: 1853: 1849: 1836: 1833: 1828: 1825: 1820: 1815: 1812: 1807: 1800: 1796: 1790: 1786: 1780: 1777: 1774: 1765: 1747: 1743: 1737: 1733: 1721: 1702: 1699: 1694: 1691: 1686: 1679: 1675: 1669: 1665: 1659: 1656: 1653: 1646: 1645: 1642: 1641: 1640: 1634: 1632: 1631: 1627: 1623: 1619: 1617: 1609: 1602: 1595: 1594: 1590: 1583: 1576: 1572: 1571: 1570: 1567: 1565: 1560: 1557: 1553: 1551: 1543: 1539: 1532: 1525: 1524: 1523: 1517: 1511: 1507: 1503: 1499: 1498: 1497: 1496: 1495: 1494: 1490: 1486: 1485:Prof McCarthy 1466: 1460: 1457: 1452: 1449: 1443: 1440: 1437: 1430: 1429: 1428: 1421: 1419: 1418: 1414: 1410: 1409:70.247.162.84 1406: 1398: 1394: 1390: 1386: 1383: 1379: 1378: 1375: 1371: 1367: 1363: 1362: 1361: 1360: 1356: 1352: 1347: 1345: 1340: 1339: 1332:lever diagram 1331: 1321: 1317: 1313: 1308: 1306: 1302: 1298: 1293: 1292: 1289: 1288: 1287: 1283: 1279: 1275: 1274: 1273: 1272: 1267: 1263: 1259: 1258:Fiddle Faddle 1254: 1250: 1249: 1248: 1247: 1244: 1240: 1236: 1235:Fiddle Faddle 1232: 1231: 1230: 1229: 1225: 1221: 1217: 1213: 1209: 1206: 1200: 1194: 1190: 1186: 1182: 1181: 1180: 1179: 1176: 1172: 1168: 1167:Prof McCarthy 1163: 1162: 1161: 1158: 1154: 1150: 1146: 1142: 1131: 1129: 1128: 1124: 1120: 1119:Prof McCarthy 1111: 1109: 1108: 1104: 1100: 1099:Prof McCarthy 1093: 1090: 1088: 1081: 1079: 1073: 1069: 1065: 1062: 1058: 1053: 1052: 1051: 1050: 1046: 1042: 1041:Prof McCarthy 1033: 1031: 1030: 1026: 1022: 1003: 999: 995: 991: 983: 981: 977: 973: 969: 968: 966: 965: 964: 963: 962: 961: 960: 959: 952: 948: 944: 940: 939: 938: 937: 936: 935: 934: 926: 925: 924: 923: 920: 916: 912: 911:Prof McCarthy 907: 906: 905: 901: 897: 893: 889: 876: 875: 874: 873: 870: 866: 862: 861:Prof McCarthy 857: 856: 855: 851: 847: 843: 839: 825: 824: 823: 822: 817: 813: 809: 808:Prof McCarthy 804: 803: 802: 801: 794: 793: 792: 791: 790: 783: 782: 779: 775: 771: 770:Prof McCarthy 766: 753: 752: 751: 745: 741: 737: 736:Prof McCarthy 732: 731: 730: 723: 721: 720: 716: 712: 711:Prof McCarthy 706: 705: 701: 697: 696:Prof McCarthy 689: 686: 684: 677: 675: 669: 665: 664: 663: 662: 658: 654: 653:Prof McCarthy 649: 648: 644: 640: 639:Prof McCarthy 635: 634: 630: 626: 625:Prof McCarthy 622: 621: 615: 614: 610: 606: 605:Prof McCarthy 599: 596: 594: 587: 585: 579: 578: 577: 576: 572: 568: 567:Prof McCarthy 560: 556: 552: 548: 544: 543: 540: 536: 532: 528: 524: 523: 520: 516: 514: 508: 506: 499: 498: 497: 496: 492: 488: 483: 481: 477: 473: 469: 465: 461: 457: 452: 450: 445: 439: 435: 431: 427: 422: 418: 417: 416: 415: 411: 407: 400: 396: 392: 388: 384: 376: 370: 366: 362: 358: 354: 346: 339: 338: 337: 336: 333: 324: 320: 315: 310: 306: 305: 304: 303: 300: 292: 283:Illustrations 282: 280: 273: 258: 254: 248: 245: 244: 241: 224: 220: 216: 215: 207: 201: 196: 194: 191: 187: 186: 182: 176: 173: 170: 166: 153: 149: 143: 140: 139: 136: 119: 115: 111: 110: 102: 96: 91: 89: 86: 82: 81: 77: 71: 68: 65: 61: 56: 52: 46: 38: 37: 27: 23: 18: 17: 2096:50.5.106.186 2090:— Preceding 2086: 2049:50.5.106.186 2043:— Preceding 2040: 2035: 2033: 2006: 1998: 1988: 1969: 1942: 1901: 1873: 1850: 1766: 1722: 1719: 1638: 1620: 1613: 1604: 1597: 1585: 1578: 1575:toothed belt 1568: 1561: 1558: 1554: 1547: 1542:toothed belt 1534: 1527: 1521: 1481: 1425: 1402: 1348: 1341: 1335: 1218: 1214: 1210: 1207: 1204: 1139:— Preceding 1135: 1115: 1096: 1082: 1077: 1061:WP:WATCHLIST 1056: 1037: 1017: 988:— Preceding 932: 886:— Preceding 882: 836:— Preceding 832: 788: 765:virtual work 748: 727: 707: 692: 678: 673: 650: 636: 618: 616: 602: 588: 583: 564: 512: 504: 484: 463: 459: 455: 453: 446: 443: 403: 344: 328: 309:pfctdayelise 286: 277: 252: 212: 147: 107: 51:WikiProjects 34: 1953:65.94.43.89 1550:false scent 369:Fluid power 341:knowledge. 332:Quicksilver 299:Wood Thrush 228:Engineering 219:engineering 175:Engineering 2133:Categories 2070:rigid body 2065:rigid body 1916:Ivanvector 1502:VanBurenen 1112:Categories 972:VanBurenen 943:VanBurenen 531:john.james 472:main brace 383:VanBurenen 291:reqdiagram 2017:Lbeaumont 1385:Jimbowley 1366:Jimbowley 1351:Jimbowley 1312:Jimbowley 1297:Jimbowley 1278:Jimbowley 1220:Jimbowley 1185:Jimbowley 1057:Watchlist 406:Wizard191 343:You say: 39:is rated 2092:unsigned 2045:unsigned 1908:Leverage 1878:Tealeafe 1868:cycling. 1399:Redirect 1310:cyclist. 1295:article. 1153:contribs 1141:unsigned 1021:Tealeafe 1002:contribs 994:Alokdube 990:unsigned 900:contribs 892:Alokdube 888:unsigned 850:contribs 842:Alokdube 838:unsigned 1945:Gearing 1622:Si Trew 1616:WP:BOLD 1577:drive, 1526:"where 1078:Dolphin 674:Dolphin 584:Dolphin 505:Dolphin 456:product 375:airbags 255:on the 150:on the 123:Physics 114:Physics 70:Physics 41:C-class 2116:Meters 2074:Meters 2036:defect 1072:WP:EAR 1068:WP:AIV 527:z-drag 421:wrench 47:scale. 2011:a = F 1852:Sjiep 1145:Phvan 28:This 2120:talk 2100:talk 2078:talk 2053:talk 2021:talk 1957:talk 1920:talk 1882:talk 1856:talk 1837:0.54 1703:0.54 1626:talk 1506:talk 1489:talk 1413:talk 1389:talk 1370:talk 1355:talk 1316:talk 1301:talk 1282:talk 1262:talk 1239:talk 1224:talk 1189:talk 1171:talk 1149:talk 1123:talk 1103:talk 1045:talk 1025:talk 998:talk 976:talk 947:talk 915:talk 896:talk 865:talk 846:talk 812:talk 774:talk 740:talk 715:talk 700:talk 657:talk 643:talk 629:talk 609:talk 571:talk 551:talk 547:AJim 535:talk 491:talk 487:AJim 480:yard 464:need 447:See 430:talk 410:talk 387:talk 314:talk 529:.-- 474:of 460:sum 426:Tom 363:or 247:Mid 142:Mid 2135:: 2122:) 2102:) 2080:) 2055:) 2023:) 1959:) 1922:) 1914:. 1884:) 1858:) 1829:13 1695:13 1628:) 1508:) 1491:) 1415:) 1391:) 1372:) 1357:) 1318:) 1303:) 1284:) 1264:) 1241:) 1226:) 1191:) 1173:) 1155:) 1151:• 1125:) 1105:) 1074:. 1047:) 1027:) 1004:) 1000:• 978:) 949:) 917:) 902:) 898:• 867:) 852:) 848:• 814:) 776:) 742:) 717:) 702:) 670:. 659:) 645:) 631:) 611:) 573:) 553:) 537:) 517:) 493:) 485:-- 432:) 412:) 389:) 381:-- 297:-- 294:}} 288:{{ 2118:( 2098:( 2076:( 2051:( 2019:( 2013:b 2009:a 1955:( 1918:( 1880:( 1854:( 1834:= 1826:7 1821:= 1816:b 1813:a 1808:= 1801:a 1797:F 1791:b 1787:F 1781:= 1778:A 1775:M 1748:A 1744:F 1738:B 1734:F 1700:= 1692:7 1687:= 1680:A 1676:F 1670:B 1666:F 1660:= 1657:A 1654:M 1624:( 1607:B 1605:N 1600:A 1598:N 1588:B 1586:N 1581:A 1579:N 1537:B 1535:N 1530:A 1528:N 1504:( 1487:( 1467:. 1461:F 1458:E 1453:F 1450:L 1444:= 1441:A 1438:M 1411:( 1387:( 1368:( 1353:( 1314:( 1299:( 1280:( 1260:( 1237:( 1222:( 1187:( 1169:( 1147:( 1121:( 1101:( 1089:) 1086:t 1083:( 1063:. 1043:( 1023:( 996:( 974:( 945:( 913:( 894:( 863:( 844:( 810:( 772:( 760:B 756:A 738:( 713:( 698:( 685:) 682:t 679:( 655:( 641:( 627:( 607:( 595:) 592:t 589:( 569:( 549:( 533:( 513:t 509:( 489:( 428:( 408:( 385:( 330:— 316:) 312:( 259:. 154:. 53::

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.

Index