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Tension-Pulley problem

  1. Oct 21, 2006 #1
    I need advice on where to stick the ag

    A (m1=9.4 kg) bucket of water is raised from a well by a rope. (ag=9.8 m/s²) If the upward acceleration of the bucket is (a=2.8 m/s²), find the force exerted by the rope on the bucket.

    Finding Fw1
    Fw1=m1(ag)
    Fw1=(9.4 kg)(9.8 m/s²)
    Fw1=92.12 N

    Finding Tension
    T-Fw1=m1(a)
    T-92.12 N =(9.4 kg)(2.8 m/s²)
    T=26.32+92.12
    T=118.44 N

    Am I doing good so far?
     
    Last edited: Oct 21, 2006
  2. jcsd
  3. Oct 21, 2006 #2

    PhanthomJay

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    Science Advisor
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    Gold Member

    Real good. You have asked about what to do with the 'ag' (acceleration of gravity, usually just referred to as 'g'). Still wondering?
     
  4. Oct 21, 2006 #3

    Astronuc

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    Staff: Mentor

    Yes, but one should show units, e.g. (9.4 kg) for mass of bucket, (9.8 m/s2) for acceleration due to gravity and 2.8 m/s2 for acceleration of the bucket being pulled by the rope.

    And for force, 1 N = 1 kg-m/s2.
     
  5. Oct 21, 2006 #4
    Thank you both, so much for your help. PhantomJay, thank you for your consideration, you helped me understand it now. Astronuc, I really appriciate your help in labeling my units.
     
    Last edited: Oct 21, 2006
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