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Machines are used to supply energy to something.

Energy supplied = Force x Distance moved in the direction of the force.

Gear wheels usually have different numbers of teeth, so if they are arranged so that the force applied moves through a greater distance than the force being overcome (the load), then the applied force will be less than the load.

For example, if force is applied to gear A with 10 teeth causes gear B with 100 teeth to move, then the applied torque will be 10 times less than the load torque.

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