c. walking
d. all of the above
letter of the correct answer.
11. In what way does friction help us in our everyday life?
a. climbing
b. swimming
12. Air resistance on a flying helicopter, an example of what type of frictions
a. dry friction
b. fluid friction
13. A boy and a girl slides down in the slide at a playground, is an example of what type of
friction?
a. dry friction b. fluid friction
d. static friction
c. rolling friction
d. static friction
c. rolling friction
14. In what way can friction be reduced?
a. using oil
b. using grease
d. all of the above
c. using a wheel
direction of the intended motion of an
15. Friction is a force that acts in the
object.
a. downward b. opposite
d. same
c. parallel​