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Physics - Rotation Question with Solution | TestHub

PhysicsRotationTranslational + RotationalEasy2 minPYQ_2020

PhysicsEasysingle choice

A uniform circular disc of radius $r$ placed on a rough horizontal plane has initial velocity $v_{0}$ and angular velocity $ω_{0}$ as shown. The disc comes to rest after moving some distance in the direction of motion. Then

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Solution:

Conserving the angular momentum of the disc about its bottom-most point, we get

$\frac{1}{2} m R^{2} ω_{0} - m v_{0} R = 0$ (Since the disc finally comes to rest, it means its total angular momentum is zero)

$v_{0} = \frac{r ω_{0}}{2}$

Subject:PhysicsTopic:RotationSubtopic:Translational + Rotational

⏱ 2mℹ️ Source: PYQ_2020

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