Which statement is true?
A box of mass M sits stationary on a rough surface. A force P is applied to the mass as shown. Which one of the following statements is true?
The mass will begin to move when the force of friction is greater than the applied force P.
The magnitude of the friction force is independent of the materials of the box and the surface.
The friction force acts in the same direction as the applied force P.
The magnitude of the friction force is dependent on the magnitude of mass M.