A solid sphere is thrown up a rough incline. The sphere rolls up without slipping and eventually comes down rolling without slipping. The direction of rolling friction in upward and downward motion respectively is ???

  • The direction of rolling friction is downward along the incline in both cases of upward and downward motion of the sphere
  • In the case of rolling motion, rolling helps the body to roll without sliding.
  • The direction of rolling friction is always opposite the relative motion between rolling body and inclined plane at the point of contact.
  • In the case of upward motion along the plane, some external force is applied on the body in upward direction. So, friction acts in downward direction.
  • In the case of downward motion along the plane, no external force is needed to apply by us. Just gravitational force is enough to cause to move down. At the point of contact with the plane, the rolling body push the plane in upward direction so that the rolling friction acts in downward direction.

  • -76
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