1. Sketch x versus , versus t, and a versus t graphs for the entire motion...

 

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1. Sketch x versus , versus t, and a versus t graphs for the entire motion of a ball rolling up and then down an incline. a. Use a coordinate system in which zero position is at the top of the incline and the positive x- direction is down the track. b. Use a coordinate system in which zero position is at the bottom of the incline and the positive x-direction is up the track. c. How do you account for any differences between the graphs in the two cases? 2. At some instant in time, can an object have zero velocity and a negative acceleration? If so, describe a possible physical situation and a corresponding coordinate system. If not, explain why not. nottom Jonolanomib-900 ni olova fo 2. Suppose a car is moving to the west. For each of the following cases, state whether the car will speed up, slow down, or remain moving at the same speed. a. The acceleration of the car is zero. b. The acceleration of the car is to the east. c. The acceleration of the car is to the west. 4. Consider the velocity vs. time graphs for two objects. a. Does either object ever turn around? If so, identify the time or times. Explain briefly in either case. b. Is there a time when both objects are speeding up? If so, identify the time or times. Explain briefly in either case. +6+ +4- +24 0 -2 Velocity, m/s 5. A velocity-time graph is shown for a cat moving along a fence. a. At which of the labeled points, if any, is the acceleration zero? Explain briefly. c. Is the acceleration of object B positive, negative, or zero at t=7 s? Explain briefly. Object B 0 b. Rank the magnitude of the acceleration of the cat at the points labeled A, B, C, and D. Explain how you determined your ranking. Object A 10 Time, s 1. Sketch x versus , versus t, and a versus t graphs for the entire motion of a ball rolling up and then down an incline. a. Use a coordinate system in which zero position is at the top of the incline and the positive x- direction is down the track. b. Use a coordinate system in which zero position is at the bottom of the incline and the positive x-direction is up the track. c. How do you account for any differences between the graphs in the two cases? 2. At some instant in time, can an object have zero velocity and a negative acceleration? If so, describe a possible physical situation and a corresponding coordinate system. If not, explain why not. nottom Jonolanomib-900 ni olova fo 2. Suppose a car is moving to the west. For each of the following cases, state whether the car will speed up, slow down, or remain moving at the same speed. a. The acceleration of the car is zero. b. The acceleration of the car is to the east. c. The acceleration of the car is to the west. 4. Consider the velocity vs. time graphs for two objects. a. Does either object ever turn around? If so, identify the time or times. Explain briefly in either case. b. Is there a time when both objects are speeding up? If so, identify the time or times. Explain briefly in either case. +6+ +4- +24 0 -2 Velocity, m/s 5. A velocity-time graph is shown for a cat moving along a fence. a. At which of the labeled points, if any, is the acceleration zero? Explain briefly. c. Is the acceleration of object B positive, negative, or zero at t=7 s? Explain briefly. Object B 0 b. Rank the magnitude of the acceleration of the cat at the points labeled A, B, C, and D. Explain how you determined your ranking. Object A 10 Time, s

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a Use a coordinate system in which zero position ... View the full answer