Cylinder on a frictionless inclined plane

  • Thread starter jp
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  • #1
jp
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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.
 

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  • #2
Doc Al
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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.
 
  • #3
HallsofIvy
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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.
 
  • #4
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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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