Kinematics Multiple-Choice Questions
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1 Kinematics Multiple-Choice Questions 1. An object moves around a circular path of radius R. The object starts from point A, goes to point B and describes an arc of half of the circle. Which of the following is true about the magnitude of displacement and traveled distance? Displacement Traveled Distance A. R 2π R B. 4R πr C. 2R πr D. R 2 E. R 4πR R 2. A rock is thrown straight up from the edge of a cliff. The rock reaches the maximum height of 15 m above the edge and then falls down to the bottom of the cliff 35 m below the cliff. What is the traveled distance of the rock? A. 15 m B. 30 m C. 35 m D. 50 m E. 65 m 3. A rock is thrown straight up from the edge of a cliff. The rock reaches the maximum height of 15 m above the edge and then falls down to the bottom of the cliff 35 m below the cliff. What is the displacement of the rock? A. 15 m B. 30 m C. 35 m D. 50 m E. 65 m 4. Can an object s velocity equal zero when object s speed is greater than zero? A. Yes, when the object moves in a straight line at a constant rate B. Yes, when the accelerates in a straight line in one direction C. Yes, when the object returns to its original position D. No, it is impossible because they are always equal E. No, it is impossible because the magnitude of the velocity is always greater that speed 5. A car accelerates from rest at a constant rate 5 m/s 2. Which of the following statements is true? A. The car travels 5 m in every second B. The car travels 10 m in every second C. The car decreases its velocity 5 m/s in every second D. The car increases its velocity 5 m/s in every second D. The car s velocity doesn t change
2 6. Position as a function of time of a moving object is presented by the graph. Which of the following is true about the type of motion? I. The object moves with a constant positive acceleration II. The object moves with a constant positive velocity III. The slope of this graph is equal to the object s acceleration IV. The slope of this graph is equal to the object s velocity V. The area under this graph is equal to the object s velocity A. I and II B. II and IV C. I, II and V D. III and V E. I and V 7. Position as a function of time of two moving objects is presented by the graph. Which of the following statements is true? I. Object I has a greater velocity than object II II. Object II has a greater velocity that object I III. At time t 0 they have the same velocity IV. At time t 0 object II passes by object I A. I B. III C. I and III D. I, II and III E. II and IV An object is thrown straight up with an initial velocity v 0. The graph represents the object s vertical displacement as a function of time. Use the graph to the right for questions 8 through What is the total flying time of the object? A. 2 s B. 4 s C. 6 s D. 8 s E. 5 s 9. At what time the object reaches its maximum height? A. 2 s B. 4 s C. 6 s D. 8 s E. 5 s 10. What is the initial velocity v 0 of the object? A. 20 m/s B. 40 m/s C. 60 m/s D. 80 m/s E. 50 m/s
3 11. Which of the following graphs represents the velocity as a function of time of an object thrown straight up? A. B. C. D. E.
4 12. Which of the following graphs represents the acceleration as a function of time of an object thrown straight up? A. B. C. D. E.
5 The relationship between the position and time of a moving object is shown on the graph. Use this graph for questions 13 and What is the instantaneous speed of the object at 4 s? A. 1 m/s B. 2 m/s C. 3 m/s D. 4 m/s E. 5 m/s 14. During which of the following times does the object accelerate? A. 0 s to 2 s B. 2 s to 4 s C. 0 s to 4 s D. 4 s to 8 s E. 0 s to 8 s The graph to the right describes the relationship between velocity and time for a moving object. Use this graph for questions 15 through What is the acceleration at time t = 1 s? A. 4 m/s 2 B. 2 m/s 2 C. -2 m/s 2 D. -4 m/s 2 E. 0 m/s What is the acceleration at time t = 8 s? A. 4 m/s 2 B. 2 m/s 2 C. -2 m/s 2 D. -4 m/s 2 E. 0 m/s What is the acceleration at time t = 6 s? A. 1 m/s 2 B. 2 m/s 2 C. 3 m/s 2 D. -4 m/s 2 E. 0 m/s What is the total displacement for the entire trip? A. 18 m B. 12 m C. 6 m D. 30 m E. 0 m 19. What is the total traveled distance for the entire trip? A. 18 m B. 12 m C. 6 m D. 30 m E. 0 m
6 20. Between what times does the object approach the origin at the constant speed? A. 0 s to 2 s B. 2 s to 5 s C. 6 s to 7 s D. 7 s to 9 s E. 9 s to 10 s 21. A rock is thrown straight up with twice the initial velocity of another. How much higher will the first rock be at its apex? A. 2 times B. 8 times C. 4 times D. 16 times E. The rocks will reach the same apex point 22. A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the speed of the pebble just before it hits the ground? A. 20 m/s B. 40 m/s C. 60 m/s D. 80 m/s 100 m/s 23. A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the height of the cliff? A. 20 m B. 40 m C. 60 m D. 80 m E. 100 m 24. An Astronaut on the Moon simultaneously drops a bird feather and a screw driver. The fact that two objects reach the surface at the same time can be explained by which of the following? A. The Moon has no gravity B. The Moon s gravity is much weaker than the Earth s gravity C. The screw driver and the feather are weightless on the Moon D. The same gravitational force is applied on both objects on the Moon E. At the given location all objects fall with the same acceleration in the absence of air resistance
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