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Physics Conservation of Matter Question

  1. Apr 9, 2009 #1
    1. The problem statement, all variables and given/known data

    Here is the set-up:
    -there is a lab bench that is a certain height above the floor, "H"
    -on the bench is a ramp that is a certain height above the bench top, "h"
    -a ball is dropped on the ramp and then is "launched" in the air and eventually falls to bounch on the ground. How can I calculate the distance from the bench where the ball bounces first?

    I have "h" and "H".



    2. Relevant equations

    To calculate the speed of the ball I did:

    Eg=Ek
    mgh=(1/2)mv^2


    I'm unsure how to proceed from here to find the distance. I don't have the mass of the ball, the acceleration or any angle for the ramp.

    Other possible equations I could use are:
    W = ∆ K Ek
    W = F d cos θ


    3. The attempt at a solution

    I know I have to take into account that there are 2 forces acting on the ball. The first is the horizontal force propelling the ball forward and the force of gravity pulling on the ball.

    I was thinking of finding Ek and Eg again and add them together for Et to use in the work formula. But I don't have the mass of the ball.

    I'm just unsure what to do from here.
     
  2. jcsd
  3. Apr 9, 2009 #2
    From what I understand, you don't need the m of the ball because:

    mgh=1/2mv^2

    therefore gh=1/2v^2
     
  4. Apr 9, 2009 #3
    I think you have to break it up into components (x and y)

    Sorry if this doesn't help
     
  5. Apr 9, 2009 #4
    No it did actually. I was working on it with a friend and it helped a lot. I figured it out now. Thanks so much!
     
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