If the angular momentum of a system is conserved, what can be said about the net

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Question: If the angular momentum of a system is conserved, what can be said about the net external torque acting on the system? (2023)

Options:

Correct Answer: It is zero

Exam Year: 2023

Solution:

If angular momentum is conserved, it implies that the net external torque acting on the system is zero.

If the angular momentum of a system is conserved, what can be said about the net external torque acting on the system? (2023)

If the angular momentum of a system is conserved, what can be said about the net external torque acting on the system? (2023)

Step 1: Understand what angular momentum is. It is a measure of how much motion an object has when it is rotating.
Step 2: Know that angular momentum can change if there is a net external torque acting on the system.
Step 3: Recognize that if angular momentum is conserved, it means it does not change over time.
Step 4: Conclude that for angular momentum to remain constant, there must be no net external torque acting on the system.
Step 5: Therefore, if angular momentum is conserved, the net external torque must be zero.

Conservation of Angular Momentum – Angular momentum is conserved in a system when no net external torque acts on it.
Net External Torque – The net external torque is the vector sum of all external torques acting on a system.