Find the mechanical advantage of a pulley system if it has an efficiency of 60%. The load lifts by 3 m when the rope is pulled by 12 m.
2.4
Velocity ratio of the pulley system = distance moved by effort ÷ distance moved by load.
VR = 12 ÷ 3 = 4
Efficiency = mechanical advantage ÷ velocity ratio, so MA = efficiency × VR
MA = 0.60 × 4
= 2.4
Check: MA ÷ VR = 2.4 ÷ 4 = 0.6 = 60%, which matches the given efficiency.
Hence, 2.4.
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Important Questions from Levers and Simple Machines
Which one of the following is CORRECT statement about Simple machines?
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- Choose the option which does NOT belong to the category of simple machine
