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ICSE Class 10 Answered

Rahul applies a force of 6 kgf to lift a 4 kg bucket from a well using a single fixed pulley. Assuming the additional force applied to be to overcome frictional force. Find the (1) frictional force (2) mechanical advantage (3) efficiency of the system.
Asked by cbiswajit | 20 Sep, 2019, 10:56: PM
answered-by-expert Expert Answer
Let us consider, acceleration due to gravity g = 10 m/s2
 
Load = 4kgf = 40 N
 
Effort = 6kgf = 60 N
 
friction force = ( 60-40 ) N = 20 N
 
Mechanical advantage = 40/60 = 2/3
 
For fixed single pulley, velocity ratio is 1
 
Efficiency = ( Mechanical advantage ) / (velocity ratio ) = 2/3
Answered by Thiyagarajan K | 21 Sep, 2019, 12:15: PM

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