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2 marksMachines and Movement

CSEC Integrated Science · May/June 2012 · Paper 2 · Question 4(a)(v)

The pulley made a squeaking sound when it was being used, so the mechanic lubricated the pulley. Explain why he now uses less effort to lift the load.

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Other parts of this question

  1. 4(a)(i)What is the function of a simple machine?[1 mark]
  2. 4(a)(ii)Name ONE simple machine other than the lever and pulley.[1 mark]
  3. 4(a)(iii)State the formula for the 'mechanical advantage of a simple machine'.[1 mark]
  4. 4(a)(iv)A mechanic uses a pulley to apply an effort of 100 N to lift a car engine of weight 1000 N. Calculate the mechanical advantage of the pulley.[2 marks]
  5. 4(b)(i)Explain why the action of the biceps, elbow joint and forearm during the lifting of the object can be referred to as a distance multiplier.[4 marks]
  6. 4(b)(ii)Name the class of lever presented in Figure 5.[1 mark]
  7. 4(c)Label on the diagram the effort, load and fulcrum.[3 marks]

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