GEARS:GEARS:

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Gears are teeth on a wheel and axel.Gears are teeth on a wheel and axel. The teeth of one gear fit between the The teeth of one gear fit between the teeth of another gear.teeth of another gear.

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When one gear turns, the other can be When one gear turns, the other can be made to turn faster, slower or in another made to turn faster, slower or in another direction.direction.

The gears on a clock allow the three The gears on a clock allow the three hands to move around the face of the hands to move around the face of the clock at different speeds.clock at different speeds.

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The wheel that moved first is called the The wheel that moved first is called the driving gear. driving gear.

Usually the driving gear is moved by a Usually the driving gear is moved by a person or a motor.person or a motor.

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The wheel that is moved by the driving The wheel that is moved by the driving gear is called the gear is called the driven gear.driven gear.

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Different sizes and arrangements of Different sizes and arrangements of gears are used to make wheels turn gears are used to make wheels turn faster, slower or in different directions. faster, slower or in different directions.

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A large driving gear makes a small driven A large driving gear makes a small driven gear move faster, but in the opposite gear move faster, but in the opposite direction.direction.

Hand driver drills use this combination of Hand driver drills use this combination of gears to make them spin quickly.gears to make them spin quickly.

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A small driving gear makes a large driven A small driving gear makes a large driven gear move slower but in the opposite gear move slower but in the opposite direction.direction.

This arrangement acts as a force This arrangement acts as a force multiplier. multiplier.

It is used to move large loads with a It is used to move large loads with a small effort.small effort.

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Pairs of gears the same size change the Pairs of gears the same size change the direction of turning without changing the direction of turning without changing the speed.speed.

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Bevel gears are gears that are at right Bevel gears are gears that are at right angles to each other and can change angles to each other and can change vertical motion into horizontal motion. vertical motion into horizontal motion.

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Rack and pinion gears consist of a flat Rack and pinion gears consist of a flat row of teeth called a rack and a circular row of teeth called a rack and a circular gear wheel.gear wheel.