Mech Tension HW-46 2. Consider the following statement made by a student about e

Question

Mech Tension HW-46 2. Consider the following statement made by a student about each of the four motions in problem 1 The magnitude of the force exerted ty the block on an individual string is the same as the magnitude of the force exerted by that string on the black. They are a third law force pair. So I don't understand why the block doesn't move at constant speed if that is true." The student has correctly identified a Newton's third law (action-reaction) force pair. Explain why this does not mean that the block must move at constant speed

Explanation / Answer

The force exerted by block on string is same as force exerted by string on block.One acts on block and one acts on string .The net force on block may not be zero ,some other force might be there.For moving at constant speed ,net force must be zero which may not happen.Just force by block on string is same as force by string on block.It does not mean net force is zero

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