1. Oil or water clinging to a surface of a jar is an example of:
A) lubrication
B) adhesion
C) force
D) magnetism

2. Friction always results in the loss of Energy, Force, Electrons, or Heat in the form of Energy, Force, Heat, or Electrons.

3. What do tire treads, rubber mats, automobile brakes, and tennis shoes have in common?

A) they reduce friction
B) they are lubricants
C) they increase friction
D) they reduce static electricity