1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Plunger on compressed spring

  1. Mar 31, 2010 #1
    1. The problem statement, all variables and given/known data

    A plunger of mass m rests on a spring with constant k. The spring is pressed down a distance x and released from rest. How large does the the mass need to be in order to keep the plunger in contact with the spring?

    2. Relevant equations



    3. The attempt at a solution

    Using the Conservation of energy equation and solving for m, I get:

    kx2/(2gh+vf2) = m

    I have a suspicion that I somehow have to incorporate the second equation into the answer, but am stumped as to how I proceed.
  2. jcsd
  3. Apr 1, 2010 #2

    Filip Larsen

    User Avatar
    Gold Member

    Perhaps you can find a way through by analyzing the acceleration of the spring-mass and consider what limits this must be within.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Plunger on compressed spring
  1. Spring max compression (Replies: 25)

  2. Compression of spring (Replies: 2)

  3. Compressed springs (Replies: 11)