A device that does some kind of work for you Simple Machines A device that does some kind of work for you

Definitions Motion – movement as a result of some force Force – A push or pull applied to an object Work – The application of force to cause an object to move in the direction of the force

Definitions continued: Load – An external force on an object Effort – The force that you apply to the machine to move the load or overcome a resistance Potential Energy – Energy at rest. Kinetic Energy – Energy in motion.

Lever – parts of a lever Fulcrum – the point around which a lever turns or pivots Effort Load *There are three classes of levers

Class one Lever The fulcrum is between the effort and the load. Examples See-saw Hammer’s Claw Scissors Nail Clippers Pliers Effort Load Fulcrum

Class Two Lever The fulcrum is at one end, and the effort is at the other. The load falls in between them. Examples: Stapler Bottle Opener Wheelbarrow Nut Cracker Effort Load Fulcrum

Class Three Lever The fulcrum is at one end on top the effort is next to the fulcrum and the load is on the end. Examples Fishing pole Your arm Hockey Stick Effort Load Fulcrum

Wheel and Axle A wheel attached to a smaller wheel or shaft to increase force or speed Example: Bicycle wheel Grindstone Steering wheel Gears

Inclined Plane A plane set at an angle to a horizontal surface forming a ramp. Example: Ramp A Roller coaster Stairs

Inclined Plane

Wedge Made up of two inclined planes that form a point. It is used to push an object apart. Example: Axe knife Doorstop

Screw Machine An inclined plane that is wrapped around a pole Example Drill bits Bottle cap C - clamps

Pulley Uses grooved wheel and a rope to raise, lower, or move a load Example Crane Flag pole Window blinds Garage door opener

Pulley

Pulley