Question

the friction force that resists the motion between two surfaces that are not moving is called:
a. sliding friction.
b. static friction.
c. rolling friction.
d. air friction.

Explanation:

Static friction acts between two surfaces that are not moving relative to each other. Sliding friction occurs when surfaces slide, rolling friction when an object rolls, and air friction (air resistance) is due to air.

Answer:

B. static friction.