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!

Kinectic energy of spring

  1. Jul 26, 2008 #1
    1. The problem statement, all variables and given/known data
    A spring of mass m is pulled away from the centre from its two ends with a velocity v at a particular instant.Find its kinetic energy.

    2. Relevant equations
    KE=.5kx2 is useless since k is not given but m is given
    So i think i will have have to use .5mv2

    3. The attempt at a solution
    the velocity of the spring will gradually decrease and will become 0 at the centre.
    if v(x) is the velocity at a particular distance from the centre then we can write
    kinetic energy=1/2 m/l*dx*v(x)2(dx being a small distance x)
    and then integrate to find KE.
    i am unable to find v(x) as a function of x.
  2. jcsd
  3. Jul 26, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi atri.shivam! Welcome to PF! :smile:

    v(x), at any particular time, will be proportional to x … that's how springs work! :smile:

    (assuming there's no wave in the spring! :rolleyes:)
  4. Jul 27, 2008 #3
    but what will be the equation of v(x)
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Kinectic energy spring Date
Find maximum kinect energy Jan 1, 2013
Kinectic Energy Mar 15, 2011
What is the Kinectic Energy of the baseball? Oct 10, 2010
Relating Kinectic energy and momentum Jul 9, 2008
Understanding work and kinectic energy? Mar 17, 2008