1. Which of the following involves the smallest acceleration: A jet plane taking off. A ball bounces off a wall without changing speed Throwing a ball. A thrown ball at its highest point.
2. Which of these graphs best represents the motion of a ball rolling down an incline? A: B: C: D:
3. When Dave rides his bicycle to school, he first goes uphill and then downhill. Of course, he goes a lot faster downhill! Which graph correctly shows how Dave's distance from home changes with time? graph A graph B graph C graph D
4. Discussion Question: Betty claims her new car can get from 0 mph to 60 mph (27 meters per second) in 10 seconds. This means Her acceleration is 2.7 m/sec2. A. Estimate how long it takes for your car to get to 10 m/sec (22 mph), starting from rest. Then calculate your acceleration as you leave a stop light. (Better yet: have someone drive you around, and use your timer to get some real data). B. What is your acceleration as your car comes to a stop at a red light? C. If you run into a bush while driving at 10 m/sec, you might come to a stop in 1/10 second (the car will have traveled 1/2 meter into the bush). What is your acceleration in this case? (Don't try this experiment). D. The drag strip record for getting from 0 to 120 mph (50 m/sec) is 11 seconds. What is the acceleration?
5. Estimate the acceleration of a runner starting a race (see the illustration below): how long will it take the girls to get to what speed? You can get some data on this by looking at movie of a race (this is http://www.youtube.com/watch?v=9lAuETT_da8&hl=en ).
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