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Help with problems relating to Force and Motion with Friction

  1. Oct 6, 2008 #1
    The coefficient of static friction between Teflon and scrambled eggs is about 0.05. What is the smallest angle from the horizontal that will cause the eggs to slide across the bottom of a Teflon-coated skillet?

    I don't know where to begin.. Can someone help me?!
  2. jcsd
  3. Oct 6, 2008 #2
    You need to think of all the forces acting, you have gravity, the normal force and friction.

    When the skillet is horizontal, gravity is perpendicular to the skillet and so is the normal force (these two oppose each other). Therefore they cancel out and the egg remains stationary so friction plays no part.

    As the angle from horizontal changes, the magnitudes of the gravitational force and the normal force no longer match, also they are not parallel. Therefore the direction of net force changes which implies friction will play a part.
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