Correct option is D
Friction is a
resistive force that opposes the relative motion of two surfaces in contact. It always acts in a direction
opposite to the motion of an object to resist sliding or rolling.
For example:
· If a car moves
forward, friction acts
backward at the points of contact between the tires and the road.
· If a book is sliding on a table,
kinetic friction opposes the motion, trying to bring the book to rest.
