If the force that leaves the machine is greater than the force that enters the machine (as in our earlier example of the hand operated jack), then the distance over which that force operates must be p...If the force that leaves the machine is greater than the force that enters the machine (as in our earlier example of the hand operated jack), then the distance over which that force operates must be proportionally smaller. For the hand operated jack, the distance the operator of the jack moves their hand in order to operate it is much greater than the distance through which the jack moves against the force of gravity on the car.
In this case, the resistive force is the weight of the body, \(m g\); the force required to lift it directly onto the table is equal to also its weight \(m g\), so the mechanical advantage for lifting...In this case, the resistive force is the weight of the body, \(m g\); the force required to lift it directly onto the table is equal to also its weight \(m g\), so the mechanical advantage for lifting the body directly (with no machine) is \(M . A .=m g / m g=1\).
