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Homework Help: Compressed vertical spring

  1. May 23, 2005 #1
    if a vertical spring is being compressed down, is the Elastic potential energy the only energy?

    Ee = .5kx^2

    is gravity included in that? or does it not play a role?

    and how could I tell how far an object would fly up in the air once the spring is released?

  2. jcsd
  3. May 23, 2005 #2
    Thats the energy with regards to the spring's compression.
    The spring's potential energy will be translated to kinetic energy, how does gravity affect this energy/
  4. May 23, 2005 #3
    well i know that the force of gravity will work against the kinetic energy...

    I have an elastic potential energy of .2 J, so the kinetic energy will also be .2 J (up) ..

    I know the mass of the item, and g, so I know that

    Fg = mg

    just not sure how to put the two together and get a height out of it.
  5. May 23, 2005 #4
    express the gravitation in terms of energy, the .2J would result in a change of gravitational potential energy.
  6. May 23, 2005 #5

    ahh ok so,

    .2J = mgh


    h = .2J/mg
  7. May 23, 2005 #6
    well i'm still a little confused, the equation E = mgh is still a potential energy equation, not the kinetic energy equation (E = .5mv^2)

    is the above solution correct? (previous post)
  8. May 23, 2005 #7
    What's confusing about it?
    The solution looks fine to me.
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