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1. MULTIPLE CHOICE: Read each item carefully then circle the letter of the correct answer. Which of the following statements best describes friction? A. It is a force that occurs between solids. B. It is a force that occurs only on rough surfaces C. It is a force that occurs between solids and liquids. It is a force that occurs when surfaces touch each other 2. Why can't a ball roll continuously on a rough surface? The rough surface is not made for balls to roll . B. The force which enables the ball to move is released C.The rough texture of the surface blocks the movement of the ball. D. The rough texture of the surface permits the movement of the ball. 3. What eventually happens to a moving object when it moves along a surface? It will continuously move. B. It will B. It will stop immediately. C. It will eventually slow down and stop. D. It will move either to the right or left side and stop. 4. Which moves fastest on a flat surface? A Ball B. Wooden box C. Block of wood sheet of paper 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? C. You move upward. A. You go with gravity D. You move downward. B. You are against gravity 9. Which of these will feel the biggest gravitational pull on earth? C. A 100-kg boxer A. A 1000-kg elephant D. A 10-kg bicycle B. A 100-g mouse 10. A baseball and a sheet of paper are dropped at the same time from the same height. What will occur if there is A. The baseball will land first. B. The paper will float slowly through the air. slu through the air. D. The baseball and the paper will land at the same time no air resistance?
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