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3.1) Moving Day* Jane is moving to a new house for the summer from her current basement dwelling. She lifts a box weighing 21 kg about 3 ft, then carries it up one flight of stairs. However, when she reaches the top of the stairs, she drops the box. First it falls straight down and strikes the top step, then, after an agonizing moment of teetering on the edge, it slides all the way back to the bottom.
3.2) Snowball Fight** Xiang and her cousin Li Hua are having a snowball fight on a frozen pond near her house. Xiang has retreated behind a tree and Li Hua is advancing towards her across the pond. Xiang hopes to force her back, so she makes a huge snowball with a mass of .23 kg and throws it at Li Hua as fast as she can, about 7 m/s. When the snowball hits Li Hua, about 1% of its kinetic energy is conserved.
3.3) Monkeying Around** A little spider monkey (let’s call her Flo) has stolen a bunch of bananas from her older brother Charley and is now running away from him with the bananas in hand. She sees salvation in a long vine and grabs the bottom, hoping to swing away.
3.4) Skiing* Sarah and her family are skiing at Monarch. At one point on Sarah’s favorite run there is a small rise of 2 m vertically, so Sarah and her mom have to start building up speed in order to make it over this hill.
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Posted on 8/1/05 © 2000-2005 Physics For Everyone. All Rights Reserved. |