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Physics 9A-C Quiz week #6 Name: 5/6/2011 last 4 of ID: mg F N å mg ￼ cos ￼ å å R R cos å mg F å mg cos ￼ å R R cos å A skier starts at the top of a very large frictionless snowball, with a very small initial speed, and skis pointed straight down the side. At what angle å with the vertical does she lose contact with the snowball and fly off at a tangent? A numerical result is expected. Solution: Doesn't this one seem impossible. If you have no idea where to start, draw a free body diagram! At the critical point the normal force will go to zero, and gravity will completely supply the centripetal acceleration. Summing forces in the
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