Home » Mechanics » System of Particles and Rotational Motion » Question
  1. A disc is rotating with angular velocity ω. If a child sits on it, what is conserved ?
    1. Linear momentum
    2. Angular momentum
    3. Kinetic energy
    4. Moment of inertia
Correct Option: B

If external torque is zero, angular momentum remains conserved.
[External torque is zero because the weight of child acts downward]
L = Iω = constant



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