AIIMS 2018 Physics Momentum MCQ Question
Assertion: Linear momentum of a body changes even when it is moving uniformly in a circle.
Reason: In uniform circular motion, velocity remains constant.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In uniform circular motion, while the speed of the object remains constant, the direction of the velocity vector continuously changes, resulting in a change in momentum. Since momentum (P) is defined as the product of mass (m) and velocity (v), any change in velocity—due to its directional change—indicates that momentum is also changing. Therefore, the statement is not simply true or false but rather highlights a nuanced understanding of motion, making option C appropriate. Options A and B oversimplify the situation by not recognizing the complexity of momentum changes in uniform circular motion.
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