AIIMS 2019 Physics Conservation of Momentum Assertion Reason Question
Assertion: Even though the net external force on a body is zero, momentum needs to be conserved. Reason: The internal interactions between particles of a body cancel out momentum of each other.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option A is correct because when the net external force on a body is zero, the principle of conservation of momentum applies, meaning the total momentum of the system remains constant. The reason provided is also true; internal interactions among particles, such as collisions, do indeed cancel out their individual momenta, thereby conserving the overall momentum of the body.
Option B is incorrect because the reason correctly explains the assertion. Option C is wrong since both the assertion and reason are true. Option D is incorrect as both statements are valid in the context of momentum conservation. Understanding these concepts is crucial for grasping the principles of classical mechanics.
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