1. Which floor has the greatest friction?
A. polished
B. sandy
C. tiled
D. wet
2. The boat sailing on the sea slows down. What kind of friction is acting on it?
A fluid
B. rolling
C. sliding
D. static
3. Which of the following statements best describes friction?
A. It is a force that occurs between solids.
B. It is a force that occurs only on rough surface.
C. It is a force that occurs between solids and liquids.
D. It is a force that occurs when surfaces touch each other.
4. How can you best reduce friction between the bottom or feet of furniture and the floor?
A by smoothing the floor.
B. by keeping furniture on their place
C. by applying lubricants like wax on the floor.
D. by putting wheels or rollers on the bottom or feet of furniture,
5. Which shows that friction is undesirable?
A. pushing furniture,
B. lighting a matchstick.
C walking on wet floors
D. using the breaks when approaching a stoplight​