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LECTURE 5
questions before lecture
think about these
- How would anyone figure out that objects in motion want to continue in motion, unless acted on by an outside influence? Is there anything in daily life that just keeps going (besides the Energizer Bunny!)?
- What is the most common "outside influence?"
- If you are running and tossing a ball up and catching it as you go, does it fall behind you or in front of you or back into your hands? Whatever your answer(s), think about when each answer might conceivably occur.
- If you perform the experiment of dropping a beer can out the car window while speeding at 75 mph, does it fall ahead of you, behind you, or beside you?
(If you perform that experiment, I hope you get your license taken away!)
- If you perform the previous experiment and then do one where the can is dropped from the car at rest, and time the fall of the can, how do the two times compare?
- What shape is the trajectory of a football kicked off "perfectly" on a windless day?
- Why might it be easier on your hands to catch a long touchdown pass as the receiver than to intercept it as the defensive back?
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Please email any questions, comments, or suggestions to
Professor Bernice Durand, bdurand@theory3.physics.wisc.edu.
Revised September 4, 1997.
Content © 1997, Bernice Durand
Images and layout © 1997, Shane Hamilton
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