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October 10, 2005

Bike gears and work

Q. How do the concepts of work and energy relate to the gears on a bicycle?

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September 19, 2005

Blocks and balls

Q. In lecture and in DR, we saw two balls crash into two wooden blocks. One ball was like a superball and the other was made out of clay. The block that the superball hit fell over, while the block that the clay ball hit did not. I don't get it -- what happened?

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