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Lever
A rigid bar that is free to move around a fixed point
Fulcrum
The fixed point around which a lever pivots
Inclined Plane
A slanted surface along which a force moves an object to a different elevation
Wedge
A device that is thick at one end and tapers to a thin edge at the other end.
Pulley
A simple machine that consists of a rope that fits into a groove in a wheel
Screw
A simple machine that consists of an inclined plane wrapped around a cylinder
Work
Force exerted on an object that causes it to move
Unit for Work
Joules (J)
Wheel and Axle
A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
Wheel and Axle Examples
Door knob, steering wheel, bike
1st Class Lever
The fulcrum is positioned between the effort and resistance
2nd Class Lever
The load is between the fulcrum and the effort
3rd Class Lever
The fulcrum is at one end of the bar and the effort is between the fulcrum and the resistance
Inclined Plane Examples
Ramps, Hills, Wedge, Chisels, Hatchets, Door Stop
Wedge Examples
Shovel, Knife, Axe, Scissors, Ice Pick, Pins, Needles
Pulley Examples
Elevators, Cargo Lift, Claw Machines, Flag Pole Pulley
Screw Examples
Jar lid, drill, bolt, faucets, bottle caps, light bulbs
Lever Examples
Crowbar, Hammer, Teeter Totter, Tweezers
Simple Machine
A machine that does work with only one movement of the machine
Machine
A device that makes work easier