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A spring balance may be labeled in both units of force (poundals, Newtons) and mass (pounds, kilograms/grams). Strictly speaking, only the force values are correctly labeled. In order to infer that the labeled mass values are correct, an object must be hung from the spring balance at rest in an
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A spring balance can be calibrated for the accurate measurement of mass in the location in which they are used, but many spring balances are marked right on their face "Not Legal for Trade" or words of similar import due to the approximate nature of the theory used to mark the scale. Also, the
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If two or more spring balances are hung one below the other in series, each of the scales will read approximately the same, the full weight of the body hung on the lower scale. The scale on top would read slightly heavier due to also supporting the weight of the lower scale itself.
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A spring scale will only read correctly in a frame of reference where the acceleration in the spring axis is constant (such as on earth, where the acceleration is due to gravity). This can be shown by taking a spring scale into an
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Spring balances come in different sizes. Generally, small scales that measure newtons will have a less firm spring (one with a smaller
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A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.
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fixed at one end with a hook to attach an object at the other. It works in accordance with
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inertial reference frame, interacting with no other objects but the scale itself.
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spring in the scale can permanently stretch with repeated use.
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Main uses of spring balances are to weigh heavy loads such as
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can be sacrificed for simplicity, cheapness, and robustness.
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Mechanism to measure force based on the extension of a spring
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The first spring balance in
Britain was made around 1770 by
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