A solid cylinder of mass `m` and radius `r` is rolling on a rough inclined plane of inclination `theta`. The coefficient of friction between the cylinder and incline is `mu`. Then.

Options

A. frictional force is always `mu mg cos theta`
B. friction is a dissipative force
C. by decreasing `theta`, frictional force decreases
D. frictiona opposes translation and supports rotation.

Answer

C, D