AlignPosition force

Hello! I wanted to know if the maxForce property of AlignPosition constraint Acts differently from the force that you use in a vectorForce. I am basically trying to make a dragging system like in Lumber Tycoon 2, where some smaller objects are easy to lift, while bigger objects are hard or completely impossible to lift.

I recently learned that if I were to multiply parts mass and the gravity level, the result number is the force that would be enough to make the part stay still in the air. So I thought that force in AlignPosition constraint would act similarly. However after testing, it turned out that part can be sometimes lifted if the force is below the (mass * gravity) number.

Do 2 of these forces act differently? May be the AlignPosition force does not take gravity in account? I want to know.