Science

Torque is not zero due action and reaction force true or false

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  1. The equal and opposite reaction force acts at the same point, so no torque there.
    HOWEVER that does NOT mean you can not spin a wheel with a fixed axle.
    If you push at rim with force F, the wheel pushes back against your hand with equal and opposite F.
    So far no torque to start a a spin.
    However so far the net EXTERNAL force on the wheel is F and it would move forward.
    SO
    if it is not to move forward there must be an equal and opposite force F exerted on the wheel by the bearings at the axle and of course by the axle on the bearings.
    Thus net external force = F - F = ZERO
    HOWEVER
    F at rim forward, and F at axle backward
    There is indeed a net Torque now = F * Radius of wheel

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