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: Newtons Law Problem Help

  1. Oct 9, 2007 #1
    Question: Just give me hint of free body diagram where force will be considered because I have to find the force.I have tried this problem with past rules but now al little force problem so the question is
    Question: A man weights 180lb;the plateform and attached frictionless pully weigh a total of 43lbs.Ignore the weight of the rope.With what force must the man pull up on the rope in order to lift himself up and the plateform upward at 1.2ft/s^2
  2. jcsd
  3. Oct 10, 2007 #2
    Newtons Law problems Help

    Dear Users
    Can i consider my problem with the (Atwood's) Machiene in opposite direction
  4. Oct 10, 2007 #3


    User Avatar
    Homework Helper

    don't worry about the atwood machine formulas...

    just use the freebody diagram of the man+platform...

    what are the forces acting on the system upwards... what are the forces acting downwards...

    If he pulls with a force F on the rope, then what is the tension in the rope?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook