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Homework Help: Spring and mass problem

  1. Oct 7, 2011 #1
    1. The problem statement, all variables and given/known data

    The mass m is attached to a spring with spring constant k, on incline which forms
    the angle α to the horizontal. The mass is stretched into the distance ℓ from the equilibrium position
    the spring and kept there. How far up the incline can the mass go after
    it is released, if friction is negligible?


    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 7, 2011 #2


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    Homework Helper
    Gold Member

    What have you tried so far?

    You must show your own attempt at the problem if you want to get help here. Please see point 1 in the below post:


    Also, problems like this should be posted in the Introductory Physics subforum. Advanced physics is reserved for upper level undergraduate and graduate level problems.
  4. Oct 7, 2011 #3
    start with setting up all the forces working just as you release the spring. At first, the spring force F(x)=-kx, (x in the direction of the plane) will be greater than the projection of gravity, but as x gets smaller, gravity will win (or even the spring might contract and push back).

    F = ma= -m*g*cos(theta) - k(-x)

    agree so far?
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