Raghav applies a force of 6kgf to draw 4 8kg bucket of water from a well using a single fixed - Physics - Machines

Question

Raghav applies a force of 6kgf to draw 4 8kg bucket of water
from a well using a single fixed pulley Assuming that all of the
extra force a applied is to overcome frictional forces, calculate
the force of friction, mechanical advantage and efficiency

Jyoti Pant · Accepted Answer

Given thatE=6kgf=6×10 N=60NL=4 8kgf=4
8×10N=48NE=T=L+friction forceSo,friction
force,f=E-L=60-48=12NMechanical advantage=L/E=48/60=0
80NNow,efficiency η=Mechanical advantage(MA)/Velocity
ratio(VR)For a single fixed pulley,VR=1So,η=MA/1=0 80/1=0 80Or
80%

Raghav applies a force of 6kgf to draw 4.8kg bucket of water from a well using a single fixed pulley. Assuming that all of the extra force a applied is to overcome frictional forces, calculate the force of friction, mechanical advantage and efficiency.