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Name Date Class Content Practice A LESSON 1 Gravity and Friction Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is used only once. 1. a push or a pull on an object A. noncontact force B. friction 2. push or pull on one object by another object C. electric force D. gravity 3. applied without touching E. lubricant F. force 4. makes hair stand on end 5. keeps you from floating away G. newton H. contact force I. magnetic force 6. makes a compass needle point north J. kilogram Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 7. unit of mass 8. unit of force or weight 9. resists the motion of two surfaces that are touching 10. reduces friction The Laws of Motion 13 Name Date Key Concept Builder Class LESSON 1 Gravity and Friction Key Concept What are some contact forces and some noncontact forces? Directions: On the line before each motion, write C if it is caused by a contact force or N if it is caused by a noncontact force. 1. rain falling 2. papers scattered by wind 3. a baseball sailing into the outfield 4. a magnet attracting a nail 5. rocks tumbling down a mountain 6. an elevator ascending 7. an arrow flying toward a target 8. lightning striking a building 9. a brick wall collapsing 10. a meteorite hitting Earth Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. Directions: Answer each question on the lines provided. 11. What is a force? 12. What is a contact force? 13. What is a noncontact force? 14. What is the unit of force? 16 The Laws of Motion Name Date Class Key Concept Builder LESSON 1 Gravity and Friction Key Concept What is the law of universal gravitation? Planet A Planet B Object X This diagram represents a star orbited by two planets—planet A and planet B. The star is also orbited by a mysterious object, object X, that entered into the star’s gravitational field. Directions: Use the diagram to answer each question or respond to each statement. 1. The gravitational force between the star and planet A is the same as the gravitational Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. force between the star and planet B. Explain why this is true. 2. The gravitational force between the star and object X is equal to the forces between the star and the two planets. From that information, what can you conclude about object X? Directions: Answer each question on the lines provided. 3. What is gravity? 4. What happens to the gravitational attraction between two objects as the distance between them increases? The Laws of Motion 17 Name Date Class Key Concept Builder LESSON 1 Gravity and Friction Key Concept How does friction affect the motion of two objects sliding past each other? Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is used only once. electrical fluid lubricants microscopic movement resistance sliding static 1. Friction is a force that opposes . 2. To push a heavy crate across a floor, you must first overcome friction, which tends to hold it in place. 3. After overcoming that form of friction, you must push against friction. 4. Friction between a surface and air or a liquid is called Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. friction. 5. Air friction on a car or airplane is also called air . 6. Friction between solid surfaces is caused mostly by roughness on a(n) scale. 7. Friction can also be caused by 8. Friction between solid surfaces can be reduced with The Laws of Motion attraction between particles. . 19