The whole idea of the lever can be summed up like this: one end of the contrivance moves more than the other. But energy cannot be lost; so to make up for this extra motion at one end more force is always exerted at the other.
This rule is true for all kinds of levers, blocks and tackles or pulley systems, automobile and bicycle gears, belt systems, cog systems, derricks, crowbars, and every kind of machine. In most machines you either put in more force than you get out and gain motion, or you put in more motion than you get out and gain force. In the following examples of the lever see if you can tell whether you are applying more force and obtaining more motion, or whether you are putting in more motion and obtaining more force:
Cracking nuts with a nut cracker.
Beating eggs with a Dover egg beater.
Going up a hill in an automobile on low gear.
Speeding on high gear.
Cutting cloth with the points of shears.
Cutting near the angle of the shears.
Turning a door knob.
Picking up sugar with sugar tongs.