When we effect by force on the board the , on the other hand the board will rise up , but if we but load the boad will be balanced , we can explain about this law by this equation ( sum of moment = 0 )
by another way
(F2*D1) - (F1*D2) = 0
that mean
moment by force = force * distance
so if we want to rise and load up and if it is have high mass , we increase the distance between the
balance point and the force which we want to use it to rise the load up , which always is less than the load weight .
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