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!

Homework Help: Simple Harmonic Motion Question

  1. Feb 27, 2005 #1
    I am going brain dead on a rather simple question. Appreciate some help.

    A mass of 4.5 KG attatched to a horizontal spring of constan 75 KN/m is compressed 0.4 m from Equilibirium and then a loose mass of 2.5 KG is placed in front of it . IF the mass is now released:

    1. at what point do the masses separate.
    2. How far apart are they when the 4.5 KG mass stops?

    Assume no friction.
  2. jcsd
  3. Feb 27, 2005 #2
    part 1:
    the mass moves at the same speed with the spring while they are in contact, so, they will separate at the point when the spring started to slow down (deccelarate) [assuming the spring is ideal, massless, and ignore the effect of gravity]
    part 2:
    the mass will not stop if it shoots horizontally... coz you assume no friction...
    if it shoots vertically, you can use conservation of energy... the energy stored in spring is 1/2 kx^2
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook