Definitions
Levers
Wheels
Gears
Simple Machines
100
the force (push or pull) that produces an action
What is effort?
100
- this common equipment on the playground is a lever
What is a teeter-totter?
100
- this happens when you twist a belt between two wheels in a belt drive system
What is changing direction?
100
- this is another name for a toothed wheel
What is a gear or cog?
100
wheels and levers are examples of simple machines
What is our current area of study in grade 4?
200
- a shaft or rod on which a wheel turns
What is an axle?
200
- a bar that can rest on a pivot or a support point.
What is a lever?
200
- this form of recreation has both wheels and gears
What is a bicycle?
200
- a gear that transmits force and motion from one gear to another
What is the idler?
200
- this is another term for an axle
What is a shaft?
300

- this is another name for "load"

What is resistance?

300
- the supporting point of a lever; also called a pivot
What is a fulcrum?
300
- this simple machine was the forerunner to the modern wheel
What is a roller
300
- the wheel or gear that transfers force to other wheels or gears
What is the driver?
300
- a wheel with a groove in the rim in which a rope or belt moves
What is a pulley?
400

This is a force that resists motion between two objects that tough 

friction 

400
- a fishing rod and a hockey stick are examples of this
What is a third class lever?
400
- the wheel or gear that is moved by the force of a driver wheel or gear.
What is the driven gear?
400
- in a two gear system, when the driver is the smaller gear, the larger gear turns ______________
What is "slower"?
400
- in a two gear system, when the driver is the larger gear - the smaller gear turns____________.
What is "faster"?
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