Question

Which of the below statement(s) is/are correct about friction?

• A. It always resists the motion of surfaces.
• B. It always resists the relative motion of surfaces.
• C. It acts in the direction of the motion of one surface with respect to another stationary surface.
• D. It acts in the direction opposite to the motion of one surface with respect to another stationary surface.

Answer 1

Answer: (B), (D)

The correct options are
B It always resists the relative motion of surfaces.
D It acts in the direction opposite to the motion of one surface with respect to another stationary surface.

Friction is a force that resists the relative motion of the surfaces in contact. The frictional force acts in the direction opposite to the direction of relative motion between two surfaces in contact.