For each statement below, write true or rewrite the italicized part to male the statement true. 18. In the particle model, the object in motion is represented by a series of single points. 19. A time interval is the difference between two locations. 20. A vector has both location and direction. 21. The zero point in a coordinate svstem is called the resultant. 22. A scalar is a measurement that does not have a direction. Circle the letter of the choice that best completes the statement. 23. In the particle model, the object in the motion diagram is replaced by . a. an arrow showing direction c. a series of single points b. a large dot d. a scalar colored green 24. The length of the displacement vector represents how far an object . a. can be thrown c. traveled in one direction b. is visible (1. can be stretched 25. Position-time graphs can be used to find the __of an object, as well as where and when two objects meet. a. velocity and position c. gravitv b. magnitude (1. time interval 26. The average speed is __ the average velocity. a. alwavs slower than c. the indirect value of b. the same as d. the absolute value of 27. The slope of an object's position-time graph is the __ of the object. a. distance c. velocitv b. displacement (1. position 28. An object's velocity is how fast it is moving and _. a. its initial position c. how far it has been b. in what direction it is moving (1. its instantaneous position Chapter 2 0 Representing Motion 2 Copyright 0 GlenceelMcGraw-Hill. a division of The McGraw-Hill Companies. Inc. Date Period Name CHAPTER 2 CHAPTER ASSESSMENT REPRESENTING MOTION Understanding Physics Concepts For each definition on the left, write the letter of the matching term on the right. 1. a system that defines the zero point of the variable you are motion diagram studying b. particle model . the speed and direction of an object at a particular instant c. coordinate 3. another term given for the size of a vector system d. origin 4. the location of an object relative to an origin position 5. tf - t f. distance 6. ratio of the change in position to the time interval during magnitude which the change occurred h. vector . a zero point in a coordinate system i. scalar 8. a graph with time data on the horizontal axis and position j. resultant data on the vertical axis k. time interval 9. a quantity with both magnitude and direction 1. displacement 10. a series of images showing the position of a moving object m. position-time over equal time intervals graph a vector that represents the sum of two or more other vectors n. instantaneous 12. the length of a vector that represents how far an object moved position O. average velocity 13. a quantity that only consists of a magnitude without a direction p. average speed 14. the location of an object at a particular instant instantaneous 15. X -X; velocity 16. the absolute value of the slope on a position-time graph 17. a simplified motion diagram that shows the object in motion as a series of points