i assume that a minimum force, F is required to initiate an acceleration clockwise by finding the force for balance.

By gear ratio,

F*(100) = F'(200) where F' is the equivalent force on the big gear on the right!


by principle of moment on the right gear,

total moment = 0

F'*200 = 1kN*(500)    ( i assume the kilo refers to kilo newton)
F(1/2)*200 =  1kN*(500)
F = 5 kN
therefore, minimum force required to set the system in motion is F > 5kN



Am i correct ?


the 180 degrees appears to be a trick question as once the system can move, the angular displacement will be achieved after some time.


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I welcome you to challenge yourself and immersed in a truly deep ICT tool for learning.  ;D