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Question

Statement A: If the force varies with time then the net force is measured by the total change in momentum of the body.
Statement B: Change in momentum and impulsive force are numerically equal.


A
A & B are correct
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B
A & B are wrong
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C
A is correct and B is wrong
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D
A is wrong and B is correct
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Solution

The correct option is D A is wrong and B is correct
Force is a rate of change of momentum.
$$Force$$ is measured as $$rate\ of\ change\ of\ momentum.$$ It is not equal to change of momentum.
$$F=\dfrac{dM}{dt}$$    or, $$F\cdot dt=dM$$
Impuse of force, $$J=F\cdot dt=dM$$
Hence, Change in momentum and impulsive force are numerically equal.
A is wrong and B is correct.

Physics

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