What Forces Act on a Man and Platform System in a Pulley Setup?

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SUMMARY

The discussion focuses on calculating the force required for a man weighing 180 lbs to lift himself and a platform weighing 43 lbs using a frictionless pulley system. To achieve an upward acceleration of 1.2 ft/s², the net force must account for both the gravitational forces acting on the man and the platform, as well as the desired acceleration. The participants emphasize the importance of constructing a free body diagram to identify the forces acting on the system, including tension in the rope and gravitational forces.

PREREQUISITES
  • Understanding of Newton's Laws of Motion
  • Familiarity with free body diagrams
  • Basic knowledge of pulley systems
  • Concept of net force and acceleration
NEXT STEPS
  • Study the principles of Atwood's Machine for comparative analysis
  • Learn how to construct and analyze free body diagrams
  • Research tension calculations in pulley systems
  • Explore the application of Newton's Second Law in dynamic systems
USEFUL FOR

Physics students, mechanical engineers, and anyone interested in understanding forces in pulley systems and dynamics.

extreme2000
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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
 
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Newtons Law problems Help

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

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