Name Date Class Directed Reading for| Section 1 = Describing Motion Content Mastery Directions: For each of the following, write the letter of the term or phrase that best completes the sentence. a. 300 m 1. A sprinter runs 200 m west and 100 m east. Her displacement is b. 100 m west a. time 2. Speed can be calculated by dividing distance by b. displacement 3. The speed of a motorcycle at a particular moment is its speed. a. average b. instantaneous 4. Earth's plates move only a few - per year. a. centimeters b. meters 5. Two cars are each traveling at 72 km/h. One car is traveling northeast, and the other is traveling south. The two cars have different a. velocities b. speeds Directions: Look at the graph. Match the letters in the graph to the sentences below. Graph of Ruth's Motion 1400 1200 1000 islance (meters) 800 600 400 200 raw-Hill. a division of The McGraw-Hill Companies, Inc. 10 15 20 25 Time (minutes). 6. Ruth stops for 10 minutes to speak to a friend. 7. She walks at a constant speed of 80 m/min. 8. She jogs 600 m in 5 minutes. 16 Motion