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Homework Help: Dropping a Ball on a Frictionless Plane

  1. Nov 10, 2009 #1
    1. The problem statement, all variables and given/known data

    A ball is dropped from 10m at a speed of 0m/s. Ground is a frictionless plane (0, 0, 0) with a normal of (0, 0, 1). Ground absorbs 20% of incoming velocity. Find position of ball after 20 seconds.

    2. Relevant equations

    If the ball hits a frictionless plane would it even bounce, or would it hit take the 20% velocity reduction and go for remaining seconds.

    3. The attempt at a solution

    So after ball hitting ground I am calculating it having a velocity of 7.70m/s, after taking 10 seonds to hit ground and then taking the 20% reduction. This is assuming it doesnt bounce and is going to roll at the 7.70m/s for the remaining seconds.

  2. jcsd
  3. Nov 10, 2009 #2
    how is it going to roll if it is frictionless?
  4. Nov 10, 2009 #3

    If it was frictionless, wouldn't it roll better, it would have no friction acting upon it to slow it down. right? or am I misunderstanding the of a frictionless?
  5. Nov 10, 2009 #4
    If it is frictionlss there is no force that has a torque.So it cannot roll.I think so
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