1. Not finding help here? Sign up for a free 30min 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!

Quick question on energy conversions

  1. Nov 26, 2009 #1
    A ball bearing is dropped from rest and falls at speed v just before hitting a spring. The spring compresses by a distance of y, and all energy is converted into elastic potential energy in the spring. We are supposed to find F exerted by spring.

    The conversion of energy, according to me, is
    0.5mv2 [KE]-->mgy [GPE] +0.5 Fy [EPE, imagine the Force against Displacement graph and EPE is area under it]

    However, the answer given is,
    0.5mv2-->mgy + Fy [I suppose this is work done]

    Which is correct and why? Im confused.

    Thanks.
     
  2. jcsd
  3. Nov 26, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The force exerted by the spring varies as the spring compresses. Is F supposed to be the average force?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Quick question on energy conversions
  1. Energy quick question (Replies: 5)

Loading...