Directed Reading A. Section: Friction: A Force That Opposes Motion THE SOURCE OF FRICTION. Skills Worksheet
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1 Skills Worksheet Directed Reading A Section: Friction: A Force That Opposes Motion Write the letter of the correct answer in the space provided. (pp ) 1. Which of the following is a force that opposes motion between two surfaces that are in contact? a. push b. gravity c. friction d. thrust THE SOURCE OF FRICTION 2. Which of the following is created when the hills and valleys of two surfaces stick to each other? a. balanced force b. velocity c. gravity d. friction 3. Which of the following can be said about the magnitude of friction between two surfaces? a. The magnitude of friction doesn t depend on anything. b. The magnitude of friction depends on many factors. c. The magnitude of friction is always constant. d. There is no magnitude of friction. The Effect of Force on Friction 4. If the force pushing surfaces together increases, which of the following occurs? a. The closer contact increases the friction. b. The closer contact decreases the friction. c. The friction stays the same. d. Friction is not involved. The Effect of Material on Friction 5. Friction is usually greater between materials that have what type of surfaces? a. large b. rough c. smooth d. small Holt California Physical Science 135 Matter in Motion
2 6. Why is the magnitude of friction between a table-tennis ball and a wood floor small? a. because the floor has a smooth surface b. because the floor has a large surface area c. because the floor has a rough surface d. because the floor has a small surface area TYPES OF FRICTION 7. What are the two main types of friction? a. smooth and rough b. kinetic and static c. light and heavy d. moving and nonmoving Kinetic Friction Use the terms from the following list to complete the sentences below. rolling moving sliding 8. The type of friction observed between surfaces is called kinetic friction. 9. The type of friction used to write with a pencil is called kinetic friction. 10. Transportation that has wheels uses kinetic friction. Static Friction Write the letter of the correct answer in the space provided. 11. What kind of friction exists when a force does not cause an object to move? a. static b. kinetic c. sliding d. rolling 12. What happens to static friction as soon as an object starts moving? a. It increases. b. It decreases. c. It stays the same. d. It is replaced by kinetic friction. Holt California Physical Science 9 Matter in Motion
3 Use the figures below to answer questions 13, 14, and 15. Write the letter of the correct answer in the space provided. Block Force applied Static friction Force applied Kinetic friction Table (A) (B) (C) 13. Look at Figure A above. Why does the block not move? a. because no force is applied b. because of the force of friction c. because of static friction d. because of kinetic friction 14. Look at Figure B above. The block does not move. What force keeps the block from moving? a. rolling kinetic friction b. sliding kinetic friction c. static friction d. kinetic friction 15. Look at Figure C above. The block is moving. What force acts against the block s motion? a. static friction b. sliding kinetic friction c. rolling kinetic friction d. gravity FRICTION: HARMFUL AND HELPFUL 16. What is one way that friction by wind and water can be harmful? a. Friction causes erosion. b. Friction causes disease. c. Friction causes overwatering. d. Friction causes drought. 17. What would happen if you tried to walk without friction? a. You would change direction. b. You would get lost. c. You would slip and fall. d. You would go slower. Holt California Physical Science 10 Matter in Motion
4 Ways to Reduce Friction 18. What does a lubricant do? a. increases friction between surfaces b. reduces friction between surfaces c. increases force between surfaces d. reduces force between surfaces 19. What can be used to reduce friction between the wheels and axles of bicycles? a. sandpaper b. brakes c. dirt d. ball bearings Ways to Increase Friction 20. How does sand on an icy road keep cars from sliding? a. It makes the surface rougher. b. It makes the surface smoother. c. It makes the surface hotter. d. It makes the surface steeper. 21. What is one way to increase friction when you sand a piece of wood? a. Freeze the wood. b. Use oil. c. Press harder. d. Use ball bearings. Holt California Physical Science 11 Matter in Motion
5 TEACHER RESOURCES Answer Key Directed Reading A SECTION: MEASURING MOTION 1. B 2. A 3. D 4. A 5. B 6. D 7. speed 8. average speed 9. meters 10. D 11. B 12. C 13. B 14. C 15. A 16. acceleration 17. positive 18. negative 19. deceleration 20. D 21. A SECTION: WHAT IS A FORCE? 1. force 2. direction, magnitude [order may be reversed] 3. newton 4. B 5. D 6. B 7. B 8. D 9. A 10. D 11. A 12. B 13. tension 14. compression 15. balanced 16. unbalanced 17. velocity 18. static 19. force 20. C 21. C SECTION: FRICTION: A FORCE THAT OPPOSES MOTION 1. C 2. D 3. B 4. A 5. B 6. A 7. B 8. moving 9. sliding 10. rolling 11. A 12. D 13. A 14. C 15. B 16. A 17. C 18. B 19. D 20. A 21. C Directed Reading B SECTION: MEASURING MOTION 1. Answers may vary. Sample answer: I cannot see Earth moving, yet I know it moves (revolves) around the sun. 2. A 3. D 4. reference points 5. Answers may vary. Sample answer: buildings; trees 6. Moving objects can also be used as reference points. 7. x 8. distance 9. m/s, or meters per second 10. Answers may vary. Sample answer: miles per hour; feet per second 11. Average speed equals the total distance traveled divided by the total time taken to travel that distance. Equation form: average speed total distance total time 12. time 13. The distance varies because the speed is not constant. Holt California Physical Science 132 Matter in Motion
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