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Simple Machines: Gears
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Simple Machines: Gears
Gears as speed multipliers
TEETH
What are Gears?
- gears are measured in teeth
- teeth are the ridges around the rim
- a gear with less teeth will spin faster
- There is no standardized width between them
Summary
- Gears are wheels that have teeth around their rim.
- They can mesh together or be linked via chain
- A set is called a gear train
- The main gear is called the driving gear, one connected is the driven gear
-When driving gear is larger than the driven gear.
-Occurs when one turn of the large cogs makes the smaller cog spin multiple times.
-Is called (you guessed it) gearing up
- Used in many everyday devices like
- cars
- motorbikes/bikes
- cranes
- watches
- tools
- have been around for
2416
Using gears on bikes
Gears as Force Multipliers
-gears used in a bicycle are called sprockets
-the pedal & crank is attached to a sprocket called the chain wheel
-Connected by chain to rear sprocket
-The front chain wheel has 3 sprockets and the rear wheel has seven
- When the driving gear is smaller than the driven gear
- The larger moves slower but the train provides more force
- Is called gearing down