Question

2. A pulley system has a velocity ratio of 4 and an efficiency of 90%. Calculate:
(i) the mechanical advantage of the system.
(ii) the effort required to raise a load of 300 N by the system.
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Answer 1

Answer:

VR = 4, դ = 90%

(i) MA = VR x դ%

= 4 x 90/100 = 3.6

(ii) MA = Load/Effort

∴ Effort = Load/MA

= 300/3.6

83.33 N