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Figure 13 shows a pulley system used to raise a mass of 5 kg through a height of 2 m when a force of 60N is applied. (Acceleration due to gravity g is 10ms-2)
qn17b

Determine the:

  1. distance moved by the effort; 
  2. work done on the load; 
  3. potential energy gained by the load (g = 10 Nkg-1). 

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  1. Effort = 2 x load distance
    = 2x2
    =alternatively:
    V.R = Effort distance  
               Load distance
    Effort distance = V.r x load distance
    = 2 x 2
    = 4
  2. Work done 
    = F x D
    = 5 x 10 x 2
    = 100J
  3. PE = Work done
    = 100j 
    ( 5 x 10 x 2) = 100J  

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