Assertion-Reason on System Conservation Laws – Rankers Physics
Topic: Rotational Motion
Subtopic: Angular Momentum and Conservation of Angular Momentum

Assertion-Reason on System Conservation Laws

Assertion: In the absence of external torque kinetic energy of a system remains conserved.
Reason: In the absence of external torque angular momentum of a system remains conserved.
 
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not correct explanation of Assertion.
Assertion is true but Reason is false.
Assertion is false and Reason is true.

Solution:

No external torque means angular momentum is conserved (Reason is true). Kinetic energy may not be conserved as internal forces can change it (Assertion is false).

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