Question

A sphere S tolls without slipping moving with a constant speed on a plank $P$. The friction between the upper surface of $P$ and the sphere is sufficient to prevent to slipping, while the lower surface of $P$ is smooth and rests on the ground. Initially, $P$ is fixed to the ground by a pin $N$. If $N$ is suddenly removed (A)$S$ will begin to slip on $P$.(B)$P$ will begin to move backwards.(C)The speed of $S$ will decrease and its angular velocity will increase (D)There will be no change in the motion of $S$ and $P$ will still be at rest

Answer 1

In rolling without slipping, at constant speed, there is no force of friction between the surface. Therefore, removing the pin causes no change to the system.Hence $\left(D\right)$ is correct.