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12 Cards in this Set

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A push or pull
Force
When a force make an object move
Work
Forces that can start or stop motion and can change speed or direction
Pushes or pulls
A force that slows or stops moving objects
Friction
Help people use force to make work easier
Simple machines
A pulling force between one object and another
gravity
Help people use force to make work easier
Simple Machines
a simple machine made of a rope or chain wrapped around a wheel
Pulley
A simple machine made of a large wheel attached to a post or axle
Wheel and Axle
A simple machine with a slanted surface Example: A ramp
Inclined Plane
Is an incline plane wrapped around a post
Screw
Two incline planes joined back to back Wedges are used to split objects or to force them apart
Wedge