Ch2_TestBank - Chapter 2, Motion in One Dimension CHAPTER 2...

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Chapter 2, Motion in One Dimension 12 C HAPTER 2 2.1 Displacement 1. A change in a physical quantity w having initial value w i and final value w f is given by which of the following? a. w i w f b. w f w i c. ( w f + w i )/2 d. none of the above 2. Displacement is which of the following types of quantities? a. vector b. scalar c. magnitude d. dimensional 3. A truck moves 70 m east, then moves 120 m west, and finally moves east again a distance of 90 m. If east is chosen as the positive direction, what is the truck’s resultant displacement? a. 40 m b. – 40 m c. 280 m d. –280 m 4. Which of the following is not a vector quantity? a. temperature b. velocity c. acceleration d. displacement 2.2 Velocity 5. In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties? a. It is positive. b. It is negative. c. It is zero. d. It can be positive, negative, or zero.
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Chapter 2, Motion in One Dimension 13 6. In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties? a. It is positive. b. It is negative. c. It is zero. d. It can be positive, negative, or zero. 7. An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object? a. + b. – c. 0 (no sign) d. any of the above 8. An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the average speed of the object? a. 0.50 m/s b. –0.50 m/s c. 0.73 m/s d. 0 m/s 9. A bird, accelerating from rest at a constant rate, experiences a displacement of 28 m in 11 s. What is the average velocity? a. 1.7 m/s b. 2.5 m/s c. 3.4 m/s d. zero 10. A cheetah can run at approximately 100 km/hr and a gazelle at 80.0 km/hr. If both animals are running at full speed, with the gazelle 70.0 m ahead, how long before the cheetah catches its prey? a. 12.6 s b. 25.2 s c. 6.30 s d. 10.7 s 11. A cheetah can maintain its maximum speed of 100 km/hr for 30.0 seconds. What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape? a. 100 m b. 167 m c. 70.0 m
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Chapter 2, Motion in One Dimension 14 d. 83.0 m 12. Jeff throws a ball straight up. For which situation is the vertical velocity zero? a. on the way up b. at the top c. on the way back down d. none of the above 13. A railroad train travels forward along a straight track at 80.0 m/s for 1 000 m and then travels at 50.0 m/s for the next 1 000 m. What is the average velocity? a. 65.0 m/s
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Ch2_TestBank - Chapter 2, Motion in One Dimension CHAPTER 2...

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