What is the angle between frictional force and instantaneous velocity of the body moving over a rough surface ?

What is the angle between frictional force and isntantaneous velocity of a body moving over a rough surface

The angle between frictional force and instantaneous velocity of a body moving over a rough surface is:

What is the angle between frictional force and instantaneous velocity of the body moving on a rough road?

What is angle between instantaneous velocity and frictional force for object moving on rough surface ?

A man walks over a rough surface. The angle between the force of friction and the instantaneous velocity of the person is

In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will