RCW1 solutions

# RCW1 solutions - Recitation ClassWork 1 solutions Physics...

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Recitation ClassWork 1 solutions Physics 203 1. A person sits in the passenger seat of a car that is traveling down a street. Describe the motion of the person as seen by each of the following observers: a. A person sitting in the backseat of the car. The person in the passenger seat is not moving. b. A pedestrian standing on the sidewalk as the car passes by. I’ll define the positive direction to be in the direction the car is traveling along the road. From the point of view of the pedestrian on the sidewalk, the person in the passenger seat of the car is moving in the positive direction. c. The driver of a second car moving in the same direction and passing the first car. The driver of the second car sees the person in the passenger seat of the first car moving in the negative direction. 2. Review your answers for question 1 and answer the following: a. Do any observers say that the person sitting in the passenger seat of the car was moving? Explain. Yes, the pedestrian standing on the sidewalk and the driver of the second car. If they were to point at the person in the passenger seat of the first car, they would have to be moving their arms to do it. b. Do any observers say that the person sitting in the passenger seat of the car was not moving? Explain. Yes, the person in the back seat of the car. From their point of view, the person in the passenger seat remains at the same position just a few feet in front of them. c. Based on your answers to parts a. and b., explain carefully what it means when an observer says an object is “moving.” In order to say if an object is moving or not, you need to specify the point of view you are observing from. An object might be moving from one point of view, but not from another. 3. The idea that different observers see the same object moving differently (called relative motion ) needs experimental testing. Consider the following experiment: Marta walks in a westerly direction carrying a ball. Her friends Eric and Joan are watching the ball. a.

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RCW1 solutions - Recitation ClassWork 1 solutions Physics...

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