# Rotational friction: Find the friction f beween the wheel and the ground

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A constant force F is horizontally applied to a wheel with mass m and radius r. The motion of the wheel is pure rotation and the acceleration of the center of mass of the wheel is a. Find the friction f beween the wheel and the ground.

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##### Solution Summary

The expert finds the friction between the wheel and the ground. With full calculations and explanations, the problem is solved.

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We need to use virtual work and conservation of energy to solve this problem.

First, since the motion of the wheel is pure rotation, friction force does not do work. Therefore, the total work done by the external force F is equal to the linear ...

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