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What is a Gear? A gear is: • A wheel that has teeth around its edge that interlock with the teeth of other gears. • Usually attached to an axle or shaft
How a Gear Works • A gear transfers circular motion from one gear to another.
Two equal-sized gears • When 2 interlocking gears have the same number of teeth, they turn at the same speed, but in opposite directions.
Two different-sized gears • When 2 gears have different numbers of teeth, they turn at different speeds. • If a small gear turns a large gear, the small gear must turn more than once to cause the large gear to complete one turn. So, the large gear turns more slowly than the small gear. • Gears can be used to change the speed of motion.
QUESTION • If we turn the large gear, what happens to the small gear? - If the large gear is turned, the small gear turns in the opposite direction and at a faster speed.
Different Types of Gears Spur Gears • The teeth meet on a flat surface • They can change the speed and direction of motion • Ex. Car transmissions
Different Types of Gears Bevel Gears • 2 gears connect at an angle • They are often cone shaped • They can change the speed and direction of motion. • Ex. Egg Beaters
Different Types of Gears Worm Gears • An axle or shaft has a screw thread that connects with another gear. • This system is often used to reduce the speed and change the direction of the motion.
Different Types of Gears Rack and Pinion Gears • A single gear, called a pinion, meets with a toothed rack. • The rack may slide or stay in one place. • The system changes circular motion into a straight line. • Ex. Railroads