8. The kind of force that acts between moving surfaces is called__________.
A. kinetic friction
B. static friction
C. rolling friction
D. sliding friction
9. it is responsible for the wear and tear of machine parts.
A. friction
B. Gravity
C. Energy
D. Resistance
10. Which is the reason why an object to slow down and stop?
A. The friction between object causes the object to slow down and eventually stop
B. The friction attached to the object in motion has no effect to its movement
C. The absence of friction makes the moving object to slow down and stop
D. The friction can't stop or slow down the moving object