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: Pulling Two Blocks W/ friction

  1. Dec 22, 2009 #1
    1. The problem statement, all variables and given/known data
    Two blocks of mass m1=80 kg and m2=100 kg and attached by a string, another sting comes off of mass m1 and is pulled horizontally (kinda looks like this) (T1 & T2 are tensions)
    m2--T2--m1--T1--> there is a coefficient of friction u=.14 for both blocks, what is the tension in both strings while the system accelerates at 2 m/s^2?

    2. Relevant equations

    3. The attempt at a solution
    Ok so for m1 horizontal forces are T1 to the right, T2 to the left and friction.
    T2=(100)(9.8)(.14)=137.2 N Friction for m1=(80)(9.8)(.14)=109.8
    So T1-T2-Ff = m1*a therefore T1=(80)(2)+(109.8)+137.2= 407 N
    Is this Correct??
  2. jcsd
  3. Dec 22, 2009 #2
    First consider the 2 block system as a 1 block system (combine their masses) then you can solve T1. Once you have this you can distribute T2 appropriately.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook