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: Pulley on inclined plane problem

  1. Jun 28, 2013 #1
    Q:Two blocks are tied together on an incline The first box is on a 30 degree incline with he horizontal and is 1 KG, the wire from it runs over a pulley that goes to a mass of 2KG . If both the pulley and the incline are frictionless:
    a) What is the acceleration of the 1.0 kg block up the incline?
    b) What is the tension in the string joining the two blocks.

    I first found the FG of the 1KG block and from that used sohcahtoa to get my normal force and my fapp (-9.8sin30) negative because it is 'wanting' to go down the incline away from the 2kg mass. For a) I used Ʃf=ma, 19.6-(9.8sin30)=3a acceleration is 4.9m/s^2
    for b) I used Ʃf=ma and had T-19.6=2(4.9) and got tension=29N
    Last edited by a moderator: Jun 28, 2013
  2. jcsd
  3. Jun 28, 2013 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    gravity wants to pull it down, but the tension wants to pull it up. Tension wins.
    yes, what direction?
    No. In what direction is the acceleration of the 2 kg block?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted