Question

FILL IN THE BLANKS:
Frictional force between two surfaces comes into play when two
to play when two surfaces are in which
contact.​

Answer 1

Answer:

Frictional force between two surfaces comes to play when the two surfaces are in direct contact.

Explanation:

Answer 2

Answer:

The force of friction between two bodies is parallel to the contact surface

Frictional force always acts parallel to two planes in contact with each other and in a direction opposite to that of relative motion of the two bodies.