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Simple Machines
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Tools that make work easier
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lever
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A stiff bar that moves about a fixed point (fulcrum)
A stiff bar that moves about a fixed point (fulcrum). It is a simple machine that is used to push, pull, or lift things. Examples: seesaw, crowbar, shovel
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Inclined plane
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A flat surface that is raised so one end is higher than the other
A flat surface that is raised so one end is higher than the other. It helps move heavy objects up or down. Example: ramp
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wedge
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Is wide at one end and pointed at the other to help cut or split other objects.
Examples: knife or ax
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Wheel and axle
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Consists of a rod attached to a wheel
Consists of a rod attached to a wheel. A wheel and axle makes it easier to move or turn things. Examples: bicycle wheels, roller skates, doorknob
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Screw
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An inclined plane wrapped around a cylinder or cone
An inclined plane wrapped around a cylinder or cone. Often used to hold objects together. Examples: jar lid, wood screw
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Pulley
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A wheel that has a rope wrapped around it
A wheel that has a rope wrapped around it. Can be used to lift heavy objects by changing the direction or amount of force. Examples: flagpole
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Compound Machine
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A combination of two or more simple machines
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Examples of Screws
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Jar lids, drill bits, screw
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Examples of pulleys
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flagpole
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Examples of inclined plane
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ramp
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Examples of wedges
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Ax, knife, door-stop
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Examples of lever
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Seesaw, crowbar
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Examples of wheel and axles
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Wagon, doorknob, skateboard
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Examples of compound machines
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Scissors, bulldozer, hammer
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