Friction

1. Which of the following statements about friction is TRUE?

• A. Friction opposes motion of objects.

• B. Friction occurs between non-rubbing surfaces.

• C. Friction causes moving objects to move faster.

• D. Friction acts in a direction similar to the direction of an object’s motion.

2. Will it be easier for a person to push a table on a carpeted floor than on tiled floor?

• A. No, because the carpeted floor is rough, so friction is lesser.

• B. No, because the carpeted floor is rough, so friction is greater

• C. Yes, because the carpeted floor is smooth, so friction is lesser.

• D. Yes, because the carpeted floor is smooth, so friction is greater.

3. When can we say that friction on a floor is greater?

• A. If the floor is wet.

• B. If the floor is tiled.

• C. If the floor is rough.

• D. If the floor is smooth.

4. Which force causes a rolling ball to stop after a few seconds?

• A. friction

• B. gravity

• C. magnetic

• D. motion

5. Why is difficult to move heavy objects on a rough surface?

• A. rough surface is slippery

• B. there is no friction on a rough surface

• C. there is lesser friction on a rough surface

• D. there is greater friction on a rough surface

6. When you are travelling along a road, how does the wet road affect friction?

• A. It increases friction.

• B. It decreases friction.

• C. It maintains friction.

• D. It increases and decreases friction

7. Which of the following forces causes objects to slowdown and eventually stop?

• A. air resistance

• B. friction

• C. gravity

• D. magnetic

8. What is the direction of friction between a moving object and a surface?

• A. toward the direction of object’s motion

• B. similar to the direction of object’s motion

• C. opposite to the direction of object’s motion

• D. perpendicular to the direction of object’s motion

9. Which activity below needs least friction?

• A. grinding

• B. skating

• C. climbing

• D. writing

10.Which activity is a way of reducing friction?

• A. applying lubricant

• B. using rubber shoes

• C. putting spikes on tires

• D. removing wheels on heavy cabinets