A gear is a wheel with teeth along the outer edge that rotates on an axle. By itself a gear can’t do much. But in combination with other gears, gear pairs can change the direction, speed, and torque (rotational force) of rotation.
One gear will turn in one direction and the other gear in the opposite direction.
The large gear on the left will turn more slowly than the smaller gear on the right. The large gear also can handle more torque (rotational force) than the small gear does.
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