Unit 6 (1-Dimensional Motion) Practice Assessment Choose the best answer to the following questions. Indicate the confidence in your answer by writing C (Confident), S (So-so), or G (Guessed) next to the question. Use the the graph below to answer the next 3 questions. 1. In the Position graph above, what is the correct description of any location to the right of the zero? a. positive displacement b. positive position c. positive distance d. positive change of displacement 2. In the Position graph above, a toy car rolls from +3 m to +5 m. Which of the following statements is true? a. The displacement is -2 m b. The distance traveled is 2 m c. The displacement is +2 m d. Both b and c are correct 3. In the Position graph above, a toy car rolls from +3 m to +5 m. It then rolls from +5 m to +1 m. Finally, it rolls from +1 m to +3 m. Which of the following statements is true? a. The displacement is 0 m b. The distance traveled is 8 m c. The displacement is +4 m d. Both a and b are correct 4. Which of the following quantities describes how fast an object moves and in what direction it moves? a. displacement b. velocity c. acceleration d. speed 5. Which of the following is the equation for average velocity? a. v avg = x b. v = x t c. v t avg = t x d. v avg = v i v f 2 6. Which of the following is the SI unit of velocity? b. m b. m sec c. sec/m d. m/sec Use the position-time graphs to answer the next 3 questions. (Assume that a y-coordinate of zero indicates a position of zero meters.) A B C D 7. Which graph shows an object that is NOT moving? 8. In which graph is the object moving in the positive direction at constant speed? 9. In which graph is the object moving in the negative direction at constant speed? 1
VELOCITY (m/s) Use the Velocity-Time graph below to answer the next 4 questions. TIME (s) 10. During which interval is the object moving at a constant velocity? a. B to C b. C to D c. D to E d. E to F 11. When is the object stopped? a. B to C b. C to D c. D to E d. E to F 12. When does the object move backward? a. B to C b. D to E c. E to F d. never 13. When does the object have the greatest constant negative acceleration? a. B to C b. C to D c. D to E d. E to F Use the Displacement-Time graph for the motion of a cat below to answer the next 2 questions. 14. According to the graph above, during which interval is the cat at rest? a. 0.0 5.0 s b. 5.0 10.0 s c. 10.0 15.0 s d. 15.0 20.0 s 15. According to the graph above, the cat has the fastest speed during which interval? a. 0.0 5.0 s b. 5.0 10.0 s c. 10.0 15.0 s d. 15.0 20.0 s 2
16. Suppose you are given a velocity versus time graph. The slope of a line drawn tangent to a point on the curve of this graph describes what quantity? a. velocity b. displacement c. instantaneous acceleration d. position 17. Which of the following line segments on a velocity versus time graph is physically impossible? a. a horizontal line b. a straight line that slopes to the left c. a straight line that slopes to the right d. a vertical line 18. Acceleration is defined as a. a rate of displacement. b. the rate of change of displacement. c. the change in velocity. d. the rate of change of velocity. 19. Which of the following is the equation for acceleration? a. a = t b. a = v t c. a = v f v i v t f t i d. All of the above are valid. 20. What is the SI unit of acceleration? a. m/s b. m 2 /s c. m/s 2 d. m s 2 21. If you know the acceleration of a car, its initial velocity, and its displacement, which of the following can you predict? a. the direction of the car s final velocity b. the magnitude of the car s final velocity c. the time it takes to travel d. all of the above 22. If a car travels 44.5 meters in 1.51 seconds, what is its average speed? a. 113 m/s b. 17.5 m/s c. 34.9 m/s d. 29.5 m/s e. not enough information 23. All of the following are vector quantities, except: a. velocity b. displacement c. acceleration d. distance 24. A vector is a quantity that is described by both magnitude and a. units b. direction c. quantity d. distance 3
Use the following graphs to answer the next 4 questions. (Assume the horizontal axis has a value of zero.) A B C D 25. Which graph would represent a possible acceleration v. time for an object that is moving with constant positive acceleration? 26. Which graph would represent a possible velocity v. time for an object that is moving in the positive direction and speeding up? 27. Which graph would represent a possible velocity v. time for an object that is moving in the positive direction and slowing down? 28. Which graph would represent a possible velocity v. time for an object that is moving in the negative direction and speeding up? Use the Velocity-Time graph below to answer the next 2 questions. 29. The graph above describes the motion of a cyclist. During the interval shown, the cyclist is a. slowing down. b. speeding up. c. traveling at the same speed. d. at rest. 30. The graph above describes the motion of a cyclist. The graph illustrates that the acceleration of the cyclist a. is constant. b. decreases. c. increases. d. is zero. 4
Use the Velocity-Time graph below to answer the following 2 questions. 31. In the graph above, how does the acceleration at A compare with the acceleration at B? a. The acceleration at A is positive and less than the acceleration at B. b. The acceleration at B is positive and less than the acceleration at A. c. The accelerations at A and B are each zero. d. The accelerations at A and B cannot be determined. 32. What is happening to the acceleration during the first four seconds? a. Acceleration is increasing b. Acceleration is decreasing c. Acceleration is increasing, then decreasing d. Acceleration is constant 33. The motion of a ball on an inclined plane can be described by the equation, x = 1 2 a( t)2. Which of the following quantities must have a value of zero? a. x i b. x f c. v i d. t f 34. A ball is dropped from rest from a cliff. What is its velocity after 2.00 seconds? a. 0 m/s b. -9.81 m/s c. -19.6 m/s d. -29.4 m/s 35. What is the displacement of the ball in the previous question after 2.00 seconds? a. 0 m b. -9.81 m c. -19.6 m d. -29.4 m 36. What is the acceleration of the ball in the previous question after 4.00 seconds? b. 0 m/s 2 b. -9.81 m/s 2 c. -19.6 m/s 2 d. -29.4 m/s 2 37. Acceleration due to gravity is also called a. negative velocity. b. displacement. c. free-fall acceleration. d. instantaneous acceleration. 5
Use the following graph to answer the next 4 questions. 38. The graph above describes the motion of a ball that is tossed straight up. At what point is the speed of the ball equal to its speed at A? a. C b. D c. E d. none of the above 39. At what point is the velocity of the ball equal to its velocity at A? a. C b. D c. E d. none of the above 40. At what point is the velocity of the ball equal to zero? a. A b. B c. C d. D e. E 41. At what point is the velocity and acceleration of the ball equal to zero? a. A b. B c. C d. none of the above 6