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 furnture on their place
C. by applying lubricants like vex 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 stopight
6. Which of the folowing statements is true?
A. Friction makes an object slide. C. Gravity pushes an object upward
B. Force is needed to stop an object. D. An object in motion will remain in motion.
7. What can be done to increase the friction between two objects?
A. make surface of one object smoother
B. put water in between the two objects
C. decrease the force pressing the two objects together
D. increase the force pressing the two objects together
8. What is the type of friction that is important to walking?
A. air friction
C. sliding friction
B. static friction
D. fluid friction​