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Theoretical Rope and Pulley Question

  1. Mar 9, 2010 #1
    1. The problem statement, all variables and given/known data

    Demonstrate using free body diagrams and equations that, using the same force, a heavier load can be lifted with a rope and pulley system than with a rope alone.

    2. The attempt at a solution

    To lift something off the ground without a pulley, the applied force must be greater than the gravitational force.

    With a pulley, the force you apply still must be great, but the pulley just changes the direction of the force/motion??

  2. jcsd
  3. Mar 9, 2010 #2


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    Consider a movable pulley.
  4. Mar 9, 2010 #3
    Does "block and tackle" sound familiar?
  5. Mar 9, 2010 #4
    the only pulley system we have learned about is the atwood machine (weight connected to person through 1 pulley)
  6. Mar 9, 2010 #5
    Instead of hanging blocks you could attach another pulley to a pulley.
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