3. Friction increases with
a. weight b. volume c. an increase in surface area
4. All materials below can help reduce friction EXCEPT
a. ball bearings
b. lubricants
C. wax
5. All materials below can help increase friction EXCEPT
a. using rubber
b. increasing the weight c. using rough surface
6. Which of the following words implies no motion?
A. force
B. friction
C. gravity
D. static
7.. Which of the following statements is TRUE?
A. Static friction results when moving objects or rough surfaces rub together.
B. Static friction occurs in a swimmer swimming in water or a boat travelling in water.
C. Static friction occurs between two objects that are in motion against each other.
D. Static friction occurs when two objects rub against each other or slide against each other.
8. Justine places the pile of books on the table. What friction is being shown?
A. fluid friction
B. static friction
C. rolling friction D. sliding friction
9. Which of the following is an example of static friction?
A. Rubbing both hands with each other
B. Feet against the ground when walking
C. The wheels of a bicycle against the ground D. A heavy box against the ground that difficult to lift and move
10. Why does static friction exists?
A. Because surfaces are smoother when you move an object
B. Because surfaces are smoother before you move an object
C. Because surfaces have imperfections and adhesion occurs between the two stationary surfaces
D. Because surfaces have imperfections but adhesion does not occur between the two stationary surfaces
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