Inclined Plane, Definition – a flat sloped surface used to raise or lower objects, How it works – lets you use less input force by increasing distance, Formula = length/height, Examples - ramp, slide, Wedge, definition a device that is thick at one end and tapers to a thin edge at the other end, How it works - changes direction by pushing materials apart, Formula = length/width, Examples - knife, zipper, Screws, Definition – an inclined plane wrapped around a cylinder, How it works - less input by increasing distance (by turning), Formula = length around the threads/ length of the screw, Examples - jar lid, bolt, Levers, Definition - a rigid bar that is free to pivot or rotate on a fixed point, called a fulcrum, How it works - can 1) change direction of input force, 2) or increase output force, or 3) increase distance, Formula = distance (input/output) from fulcrum, Examples - seesaw, crowbar, Wheel and Axle, Definition – simple machine that consists of two attached, circular objects that rotate about a common axis, How it works – it can either increase force or increase distance, Formula = radius of wheel/radius of axle, Examples - doorknob, screwdriver, Pulley, Definition – a simple machine made of a grooved wheel with a rope or cable wrapped around it, How it works -either decreasing the amount of input force needed to lift an object or changing the direction of your input force, Formula = number of sections of supporting ropes, Examples - flagpole, crane.

Simple Machines

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