5. A bicycle moves faster on a cemented road than on a bumpy road. Why?
A. Friction is greater on a cemented road.
B. Friction is lesser on a cemented road.
C. There is no friction on a cemented road.
D. The bicycle can roll only on a cemented road.
6. Which shows that friction is undesirable?
A. Pushing furniture. C. Walking on wet floors.
B. Lighting a matchstick. D. Approaching a stoplight.
7. Why does a car travel faster in going down than in going up?
A. It is moving against gravity.
B. It is being pushed by the wind.
C. It is moving toward gravity.
D. It is being pulled by the weight of the car.
8. Why is it difficult to climb up the stairs rather than to go down the stairs?
A. You go with gravity.
C. You move upward.
B. You are against gravity.
D. You move downward.
9. Which of these will feel the biggest gravitational pull on earth?
A. A 1000-kg elephant
C. A 100-kg boxer
B. A 100-g mouse
D. A 10-kg bicycle
10. A baseball and a sheet of paper are dropped at the same time from the same height. What will
occur if there is no air resistance?
A The baseball will land first
B. The paper will float slowly through the air
C. The baseball will float slowly through the air
D. The baseball and the paper will land at the same time
11 Which has the greatest friction?
A Polished floor
C wet floor
B sandy floor
D. Tiled floor​