Question 694: Centre of Mass and Rotational Motion

Question

A disc is rotating with angular speed $$\omega $$. If a child sits on it, what is conserved

Accepted Answer

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

Answer

linear momentum

Answer

angular momentum

Answer

kinetic energy

Answer

potential energy.

Centre of Mass and Rotational Motion

A disc is rotating with angular speed $\omega $. If a child sits on it, what is conserved

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