A) directed up the plane
B) directed down the plane
C) zero
D) dependent on its velocity
Correct Answer: A
Solution :
Since, the body rolls without sliding. \[{{a}_{p}}=0\] and \[{{v}_{p}}=0\] \[\Rightarrow \] \[V-r\omega =0\] and \[a-r\alpha =0\] \[\Rightarrow \] \[v=r\omega \] and \[a=r\,\alpha \] Since, the body acceleration 'a' is downwards parallel to the plane. Therefore, acceleration of the body must be in anti-clockwise sense. That means the friction must act up the plane to produce an anti-clockwise torque to produce anti-clockwise angular acceleration.You need to login to perform this action.
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