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Suspended ball

  1. Dec 7, 2006 #1
    1. The problem statement, all variables and given/known data

    a ball of mass m is attached to a light string of length L and suspended vertically. A constant force, which magnitude F equals the weight of the ball, is applied horizontally to the ball. Determine the speed of the ball as t reaches the 90degree level in terms of L and g= 10 m/s^2

    2. Relevant equations

    not sure really!

    http://img132.imageshack.us/img132/7374/phyiscsek4.jpg [Broken]

    3. The attempt at a solution

    I honestly do not have a clue where to start on this question. Can anyone give me a start?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Dec 7, 2006 #2
    desperately need help! :(
  4. Dec 7, 2006 #3


    User Avatar

    Staff: Mentor

    Write the equations of motion for the ball. The string constrains how it moves, and the two forces acting on it are gravity downward and the horizontal pushing force. What are the kinematic motion equations that you should start with? Use x and y coordinates to separate the two components of position, velocity and acceleration....
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