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Third Law of Motion

Spring scale ...

Question

Spring scale reads $20 N$ as it pulls a $4.0 k g$ object across a table. What is the magnitude of the force exerted by an object on the spring scale?

A

40 N

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B

20 N

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C

4 N

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D

5 N

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Solution

The correct option is B $20 N$
According to Newton's third law of motion, every action has its equal and opposite reaction.
Thus the object exerts the same amount of force on the spring scale as the force exerted by the spring scale on the object i.e. $20$ $N$ .

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