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7. Sliding friction is when two
surfaces slide over one another.
b. liquid
d. both a and b
c. gas
a. solid
8. Swimming fish experience-
a. fluid friction b. sliding friction
c. rolling friction d. static friction
9. Which of the following is an example of
friction that is helpful?
a. Tread on the bottom of your shoes
b. Brakes used on a bike
c. Tires from a car on the road
d. All are examples that are helpful
10. Which of the following is an example of
friction that is harmful?
a. Using an eraser to erase marks
b. Sand placed on ice in the winter
c. Engine parts wearing out
d. Pencil Marking on paper​