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1 REPRESENTING MOTION Vocabulary Review Write the term that correctly completes the statement. Use each term once. average speed instantaneous origin resultant average velocity position particle model scalar coordinate system instantaneous velocity position time interval displacement magnitude position-time graph vector distance motion diagram 1. The speed and direction of an object at a particular instant is the.. Another term given for the size of a quantity is the. 3. The is the location of an object relative to an origin. 4. The formula t f t i represents. 5. A is a quantity with both magnitude and direction. 6. Ratio of the change in position to the time interval during which the change occurred is the. 7. A system that defines the zero point of the variable you are studying is the. 8. The zero point is also called the. 9. A graph with time data on the horizontal axis and position data on the vertical axis is a. 10. A shows a series of images showing the position of a moving object over equal time intervals. 11. A vector that represents the sum of two or more vectors is a. 1. A simplified motion diagram that shows the object in motion as a series of points is a. 13. A scalar quantity that is the length, or size, of the displacement vector is. 14. A quantity that has only magnitude is. Chapter Representing Motion 1
2 The location of an object at a particular instant is. 16. The vector quantity that defines the distance and direction between two positions is. 17. The absolute value of the slope on a position-time graph is. SECTION 1 Picturing Motion In your textbook, read about motion diagrams. Refer to the diagrams below to answer questions 1 5. Circle the letter of the choice that best completes the statement. 1. In set I, the object that is moving is. a. A c. C b. B d. none of the above. Set II shows that object B is. a. at rest c. slowing down b. increasing its speed d. traveling at a constant speed 3. Set shows object B is changing direction. a. I c. III b. II d. IV Chapter Representing Motion
3 4. Set shows object B at rest. a. I c. III b. II d. IV 5. Set shows object B traveling at a constant speed. a. I c. III b. II d. IV SECTION Where and When? In your textbook, read about coordinate systems. Refer to the diagrams below to answer questions What are the position vectors for A, B, C, D, and E?. If the object is moving from left to right in D, and each division represents the passage of 1 s, what is the velocity of the object? 3. If the object is moving from right to left in D, what is the velocity of the object? Chapter Representing Motion 3
4 4. In which sets are there objects with positive position vectors? 5. In which sets are there objects with negative position vectors? SECTION 3 Position-Time Graphs In your textbook, read about position-time graphs. Refer to the diagram below to answer questions What quantity is represented on the x-axis?. What quantity is represented on the y-axis? 3. What is the position of the object at 6.0 s? 4. How much time has passed when the object is at 6.0 m? 5. How far does the object travel for every second it is in motion? 6. If the object continues at this speed, when will the object reach 18.0 m? 7. Where will the object be after 300 s? Chapter Representing Motion 4
5 SECTION 4 How Fast? In your textbook, read about speed and velocity. Refer to the diagram below to answer questions What is the formula for finding t?. Find t for the change in position from x = 5 m to x 15 m. 3. What is the formula for finding x? 4. Find x for the time interval from t =.0 s to t = 8.0 s. 5. What is the formula for finding the slope on a position-time graph? Chapter Representing Motion 5
6 6. What is the slope of this line? 7. What does the absolute value of the slope of this line represent? 8. What is the speed of this object in m/s? 9. If this object continues at the same speed, how long would it take this object to reach a position of x 150 m? 10. If this object continues at the same speed, how far will it have traveled when t 00 s? 11. What formula would you use to determine the position of this object if it had an initial position vector and then traveled at a fixed velocity for a certain amount of time? 1. How far will this object have traveled if it had an initial position of 0 m and traveled at a speed of.5 m/s for 48 s? Chapter Representing Motion 6
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