Rotational Motion Question 45
Question: A disc is rotating with angular velocity $ \omega $ . If a child sits on it, what is conserved?
[AIPMT 2002]
Options:
A) Linear momentum
B) Angular momentum
C) Kinetic energy
D) Moment of inertia
Show Answer
Answer:
Correct Answer: B
Solution:
- If no external torque is applied on the system then angular momentum of the system remains constant.
When a child sits on rotating disc, then no torque is applied (weight of child acts downward), so angular momentum will remain conserved.
