Gear as a simple machine

A gear is a wheel and axle with the wheel having teeth around its rim. When the teeth of two gears interlock, the turning of one gear causes the other gear to turn.

figure 1: gears

features of a gear

When two gears of different sizes are interlocked, they rotate at different rates.

Each rotation of the larger gear causes the smaller gear to make more than one rotation.

If the input force is applied to the larger gear, the output force exerted by the smaller gear is less than the input force.

Gears also may change the direction of the force, as shown in Figure 1. When the larger gear is rotated clockwise, the smaller gear rotates counterclockwise.

If an input force is applied to the larger gear and it rotates clockwise, the smaller gear rotates counterclockwise. The output force exerted by the smaller gear is less than the input force applied to the larger gear.

Gear as a simple machine
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