1 Which of the following statements best describes friction? A It is a force that occurs between solids C. it is a force that occurs between solids and liquids 8. It is a force that occurs only an rough surfaces Dit is a force that occurs when surfaces touch each other 2. Why can't a ball roll continuously on a rough surface? A. The rough surface is not made for ball to roll. C. The rough texture of the surface blocks the movement of the ball. B. The force which enables the ball to move is released 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? A will continuously move C. It will eventually slow down and stop Bit will stop immediately D. It will move either to the right or left side and stop 4 Which move faster on a flat surface? B. Wooden box C. Block of wood D. 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. C. There is no friction on a cemented road. B Friction is lesser on a cemented road. D. The bicycle can roll only on a cemented road. 6. Which shows that friction is undesirable? A Pushing furniture B. Lighting a matchstick C. Walking on wet floors D. Approaching a stoplight 7. Why does a car travel faster in going down than in going up? A it is moving against gravity C. It is moving toward gravity. B. It is being pushed by the wind. Dit 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 B. You are against gravity C. You move upward D. You move downward. 9. Which of these will feel the biggest gravitational pull-on Earth? A 1000-kg elephant B. 10-g mouse C. 100-kg boxer D. 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 at resistance? A. The baseball will land first. C. The baseball will float slowly through the air B. The paper will float slowly through the air. D. The baseball and the paper will land at the same time 11. Why did a ball throw to the air fail back to the ground? A Gravity caused the ball to fall. C. Acceleration caused the ball to move fast. B. Air caused the ball to fall on the ground D. The weight of the ball made it move faster 12. Which has a greatest friction? A Polished floor B. Sandy floor < Tiled floor D. Wet floor 13. The boat sailing on the sea slows down. What kind of friction is acting on it? A Fluid friction B. Rolling friction C.Static friction D. Sliding friction 14. Why is a parachute important to a skydiver? A. it directs his motion C. It keeps him appear beautiful as he falls. B. It makes him fall faster. D. It slows down his motion to have a safe landing 15. How is brake useful? it uses friction to A. Move the vehicle easily C. Slow down a moving vehicle. B. Make vehicle move faster. D. Move the vehicle to any direction.
