# Homework Help: Newtons Law Problem Help

1. Oct 9, 2007

### extreme2000

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
Thanks

2. Oct 10, 2007

### extreme2000

Newtons Law problems Help

Dear Users
Can i consider my problem with the (Atwood's) Machiene in opposite direction
Thanks

3. Oct 10, 2007

### learningphysics

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?