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# Simple Machines

TermDefinition
Simple Machine A machine that does work with only one movement
Wheel and Axle a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects
Pulley Pulley A simple machine that consists of a rope that fits into a groove in a wheel. Used to lift things.
Inclined Plane A flat surface set at an angle or an incline with no moving parts that is able to lift objects by pushing or pulling the load.
Wedge An object that comes to a thin edge and is used for splitting or for cutting. Is used by being driven into something.
Screw An inclined plane wrapped around a cylinder. Used to put things together
Lever a simple machine that consists of a bar that pivots at a fixed point called a
What is the purpose of a pulley? The purpose of a pulley is to make lifting heavy objects easier by distributing the force.
When you add multiple pulleys together, what happens to the amount of force needed? The amount of force needed is reduced because the weight of the object/load is divided by the number of pulleys
To use the least amount of force while using a pulley you should... Use several pulleys together
What is the relationship between the number of pulleys and the weight of an object/load? The weight is divided by the number of pulleys
The disadvantage to using a lever Force must be applied over a longer distance.
Examples of levers: wrench, seesaw
Examples of wheel and axles: bicycle, tires
Examples of a wedge: saw, scissors,
Gears wheels with teeth that can either increase the speed of a machine or its force, but not both at the same time
Examples of gears: clock, lock on a safe
Examples of screws: Camera Tripod, things that put objects together
Examples of pulleys: Water well/wishing well
Fulcrum The fixed point that a lever rotates around
mechanical advantage Ratio of the force exerted by a machine to the force applied to the machine.

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