# cylinder on a frictionless inclined plane

by jp
Tags: cylinder, frictionless, inclined, plane
 P: 3 I just have a question about cylinder. If a cylinder is on a frictionless inclined plane, does it spin as it comes down? I guess on a level surface, frictional force is required for a cylinder to roll, but I'm not sure about inclined plane.
Mentor
P: 40,240
 Originally posted by jp If a cylinder is on a frictionless inclined plane, does it spin as it comes down? I guess on a level surface, frictional force is required for a cylinder to roll, but I'm not sure about inclined plane.
If the cylinder is started from rest, it will just slide down without rolling. A friction force is required to exert the torque needed to start it spinning about its center.
 PF Patron Sci Advisor Thanks Emeritus P: 38,400 More precisely, since gravitational force acts on every point of the object, it is the same as if it acted only on the "center of gravity"- since the net force is through the center of gravity there is not torque and so no rotation.
P: 662

## cylinder on a frictionless inclined plane

Since all the forces are passing through COM and there is no physical interaction due to friction hence it must slide

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