A bicycle wheel starts at rest and then begins rolling under the influence of a

Question

A bicycle wheel starts at rest and then begins rolling under the influence of a torque applied through the chain by the rider. When friction acts on the wheel, what does it do?

A) It produces an additional torque that increases the rotational acceleration, but it only counts as an internal force, so it no effect on the linear motion of the center of mass of the wheel.

B) It produces an additional torque that increases the rotational acceleration, and at the same time it acts as an external torque to get the wheel moving forward.

C) It produces a counter torque that reduces the rotational acceleration, but at the same time it acts as an external force to get the wheel moving forward.

D) It produces a counter torque that reduces the rotational acceleration, but it only counts as an internal force so it has no effect on the linear motion of the center of mass of the wheel.

Explanation / Answer

D)It produces a counter torque that reduces the rotational acceleration, but it only counts as an internal force so it has no effect on the linear motion of the center of mass of the wheel. Clearly so. I believe. No linear motion will be generated by the internal force torque.

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