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A Uniform Wheel of Radius R is Set into Rotation About Its Axis at an Angular Speed ω. this Rotating Wheel is Now Placed on a Rough Horizontal Surface with Its Axis Horizontal. - Physics


A uniform wheel of radius R is set into rotation about its axis at an angular speed ω. This rotating wheel is now placed on a rough horizontal surface with its axis horizontal. Because of friction at the contact, the wheel accelerates forward and its rotation decelerates till the wheel starts pure rolling on the surface. Find the linear speed of the wheel after it starts pure rolling.

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Initial angular momentum,

\[L = I\omega\]

\[     = \frac{1}{2}m R^2 \omega\]

Angular momentum after it starts pure rolling,

\[L' = I\omega' + m\left( v \times R \right)\]

\[       = \frac{1}{2}m R^2 \left( \frac{v}{R} \right) + mvR\]

\[       = \frac{3}{2}mVR\]

As no external torque is applied, angular momentum will be conserved.

Therefore, we have

`L = L'`

\[\Rightarrow \frac{1}{2}m R^2 \omega = \frac{3}{2}mvR\]

\[ \Rightarrow v = \frac{\omega R}{3}\]

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HC Verma Class 11, 12 Concepts of Physics 1
Chapter 10 Rotational Mechanics
Q 81 | Page 200
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