Question

A sphere rolling on horizontal surface starts moving up a rough inclined plane. If sphere rolls without slipping, then the frictional force on sphere is acting

• A. Is zero
• B. In downward direction along inclined plane
• C. In vertically upward direction
• D. In upward direction along inclined plane

Answer 1

The correct option is D In upward direction along inclined plane

Answer (1)
As $mg\sin \theta$ will reduce the speed of COM, therefore for pure rolling, angular speed should also bereduced. Hence, frictional force will act upward along the inclined plane.