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: Contact Forces problem

  1. Oct 5, 2004 #1
    This problem seemed very straightforward but I've somehow missed something...

    Three blocks (M1, M2, M3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to M1.

    If M1= 1.67kg, M2= 2.67kg, M3= 3.78kg, and F= 16.1 N:

    a) what is the magnitude of the contact force between blocks 1 and 2
    b) what is the magnitude of the contact force between blocks 2 and 3

    I used the formula P=(M2/M1+M2) x F to find these contact forces, but the answers I got were not correct.

    for a) I calculated P= (2.67/1.67+2.67) x 16.1
    and for b) I calculated P= (3.78/2.67+3.78) x 16.1

    This seemed like it should lead to the right answer, but it didn't work. Anyone know what I've done wrong???
  2. jcsd
  3. Oct 5, 2004 #2


    User Avatar
    Homework Helper

  4. Oct 5, 2004 #3
    that makes sense :) thanks for the help
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook