The working principle of a spring balance is the increase in length of the spring is ------ proportion to the weight of the body suspended. * (inversely ,directly ,not)
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Spring balance is used to measure the weight of the object. When a load is hung on the spring, it stretches and the spring's extension is proportional to the weight of the object. The working principle of the spring balance is Hooke's law which is F=−kx.
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