Helpful Definitions

Compound Machine: A machine composed of multiple simple machines

Force: External action acting on an object to make it move.

Fulcrum: The point where a lever or similar object swings or pivots.

Inclined Plane: A flat surface with one end higher than the other (like a ramp).

Lever:Rigid bar that swings on a central point called a fulcrum.

Machine: Objects that transfer energy and movement between parts in a way we can expect.

Pulley: A rope that can move across a wheel with a groove in the middle.

Screw: An inclined plane wrapped around a pole.

Simple Machine: Any of several devices with few or no moving parts that are used to modify motion in order to perform work. They can classified as: wedges, inclined planes, pulleys, screws, wheels and axels, and levers.

Wedge: A thin edge forces material apart.

Wheel (and Axle): A hoop that can spin freely around a central point.

Work: A measure of energy transfer. It occurs when an object is moved over a distance by an external action.