2. Friction force exist between their contact surfaces. Which of the following surfaces will a toy car meet more friction? a Rough roads
b. cemented pavements
c. asphalted pathways
d grassy playground

3. How does friction affect speed?
a. Greater friction increases speed
c. More friction decreases speed
b. Lesser friction decreases speed
d. Less friction increases speed

4. Zhane rolls a ball on a pavement Eventually, the ball stopped. Why?
a. Friction between the surface of the ball and the pavement stopped the ball rolling
b. Friction between his hand and ball stopped the ball rolling
c. Weight of Zhane stopped the ball
d. Friction is in the same direction as the ball moved.

5. Which of the following statements about friction is true?
a. It acts opposite to the objects natural motion
b. Different types of surfaces create different amount of friction
c. It depends on the type of motion that occurs between two surfaces.
d. A to C

6. All materials below can help increase friction except
a. Applying wax
b. using rough surfaces
c. increasing weight
d. none of these

7. Friction is always present. It has desirable and undesirable effects. Which of the following is is undesirable effect?
a. It stops a vehicle on applying the brakes.
c. We can write a letter on chalkboard
b. It causes wear and tear of machines
d. Allows you to play without slipping

8. Which is the weakest frictional force that opposes motion?
a. Rolling Friction
b. Sliding Friction
c. Static Friction
d. Kinetic friction

9. Books in the shelves have
a. Static Friction
b. Kinetic friction
c. Sliding Friction
d. Rolling friction

10. Which is incorrect about kinds of friction?

a Friction force exists between contact surfaces is static friction
b. Kinetic friction opposes sliding friction c.Rolling friction exists in rolling motion
d. Kinetic friction has the weakest frictional force that opposes motion​