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A ball rolling down a slope

  1. Oct 2, 2013 #1
    neglecting friction from the slope and air resistance,
    what are the possible forces acting on the ball?

    i can only think of 2:
    gravitational force by the earth on the ball.
    normal force exerted by the slope on the ball.

    are there any other forces else that i missed out?
  2. jcsd
  3. Oct 2, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Sounds like that's about it.

    Of course, if the ball is rolling down the slope, there is usually friction involved. (Else it would just slide.)
    Last edited: Oct 2, 2013
  4. Oct 2, 2013 #3
    In ideal conditions you are correct.

    Real world: Energy transfer/inefficiencies would include mechanical to heat, sound, if hitting some rocks (sparks) light... if it's a metal ball passing over any magnets in the ground, electric.
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