Question

fill in the blank question
a scale can be used to exert a constant unbalanced force. it contains a that stretches proportionally to the of the applied force.
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Explanation:

A spring scale is used to measure force. Hooke's law states that the extension of a spring is proportional to the force applied. So, the first blank is "spring", the second is "spring", and the third is "magnitude".

Answer:

A spring scale can be used to exert a constant unbalanced force. It contains a spring that stretches proportionally to the magnitude of the applied force.