The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is

Assessment: JAMB UTME - Physics - 2001 Subject: Physics

Question 1 Report

60%

50%

40%

33%

Answer Details

ince the number of pulleys present is 6, it implies that the velocity ratio VR = 6

∴ efficiency =

M.A

x	100
	1

V.R

= Load/Effort x 1/V.R x 100/1
= 240/80 x 1/6 x 100/1
= 50%
∴ Efficiency = 50%

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