JAMB - Physics (1978 - No. 2)
The frictional force between two bodies?
exists only when there is relative motion or tendency for motion
acts so as to oppose the motion
depends on the normal reaction between the two surfaces
is relatively independent of the area in contact
has all of these characteristics
Giải thích
Frictional force is the opposing force that is created between two surfaces that try to move in the same direction or that try to move in opposite directions.
The main purpose of a frictional force is to create resistance to the motion of one surface over the other surface.