[Illustration: FIG. 113.--Cogwheels.]
Experiment demonstrates that a weight _W_ attached to a cogwheel of
radius 3 can be raised by a force _P_, equal to one third of _W_
applied to a cogwheel of radius 1. There is thus a great increase in
force. But the speed with which _W_ is raised is only one third the
speed with which the small wheel rotates, or increase in power has
been at the decrease of speed.
This is a very common method for raising heavy weights by small force.
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