Asked by Sawai
                Torque is not zero due action and reaction force true or false
            
            
        Answers
                    Answered by
            Damon
            
    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
    
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
                    Answered by
            Tooba Midhat 😎
            
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