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!

Spring Problem

  1. Oct 6, 2005 #1
    A massless pan hangs from a spring that is suspended from the ceiling. When empty, the pan is 50cm below the ceiling. If a 100g clay ball is placed gently on the pan, the pan hangs 60cm below the ceiling. Suppose the clay ball is dropped from the ceiling onto an empty pan. What is the pan's distance from the ceiling when the spring reaches its maximum length?

    I figured I'd start by finding the final velocity of the ball using the gravitational potential energy.
    Ugi=0.49 J
    Ugf=0 J
    Vf=sqrt[(-2 * (Ugf - Ugi)) / m]
    Vf=sqrt[(-2 * -0.49) / 0.5)]
    Vf=1.4 m/s

    Next, I found the spring constant (k) using the stationary weight of the ball in the pan.
    Fsp=(0.1)(9.8)=.98 N
    Fsp=k*(Delta S, or change in spring length)
    .98 N=k*0.1

    Now I'm stuck, can't seem to find the right formula to use to get any farther, I should have just the one more step I think. If someone could post a formula or explain where I need to go next I would appreciate it. I have a lab in 15 minutes, but I'll be back after that to work on this some more.

    Thanks (=
    Last edited: Oct 6, 2005
  2. jcsd
  3. Oct 6, 2005 #2


    User Avatar
    Homework Helper

    Potential energy of a spring:
    [tex]W = \frac{1}{2}kx^2[/tex]
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Spring Problem
  1. Spring tray problem (Replies: 1)

  2. Spring Problem (Replies: 1)

  3. Spring Problem (Replies: 2)

  4. Problem with a spring (Replies: 6)

  5. Springs problem. (Replies: 3)