What Causes a Sphere to Rotate on a Ramp with Negligible Friction?

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A sphere at rest on a ramp with negligible friction experiences only gravity and the normal force, both acting through its center of rotation. This means there is no net torque (τ=0) to initiate rotation. Without friction, the sphere will not rotate but will instead slide down the ramp. The discussion emphasizes that rotation is contingent upon the presence of friction. Therefore, without friction, the sphere simply slides without any rotation occurring.
Kiwiro0ls
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If I have a sphere at rest on top of a ramp, if friccion is negligible, the only forces acting on it would be gravity and the normal force. Both of these go through it's axis of rotation which would be the spheres center. What would cause the rotation then so τ≠0?
 
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Kiwiro0ls said:
What would cause the rotation then so τ≠0?
What makes you think it would rotate?
 
I guess there's no rotation at all unless there's friccion? boo...
 
Right. Without friction, the sphere will just slide.
 

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