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# Simple Machines

by

## Mr. Apperley

on 28 October 2013

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#### Transcript of Simple Machines

Everything we have looked at
and more!
Simple Machines
Simple Machines
Simple machines make work easier for us by allowing us to push or pull over increased distances.
Levers
A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force
First Class
lever
The fulcrum is in the middle between the effort force and the resistance force.
Second Class lever
Third Class Levers
The resistance force is in the middle between the
effort force and the fulcrum.
The effort force is in the middle between the
resistance force and the fulcrum.
A pulley is a simple machine that uses grooved
wheels and a rope to raise, lower or move a load.
Pulleys
A pulley is a wheel with two raised edges so that a rope or a string will run along the wheel without coming off.
\
An inclined plane is any slope or ramp, like a wheelchair ramp or a slide
.It makes it easier to lift something heavy, like a rock. Instead of lifting the rock straight up, you can push it a greater distance,
but with less force.
Inclined plane
A screw is an inclined plane wrapped around a central core into a spiral shape. Screws can do two things. First, they can convert a force that goes around and around into a force that goes up and down. Second, screws can thread into things like wood or a metal bolt so that the two things are interlocked and can't come apart. That's the most common use of screws today.
Screw
Wheel and Axle
A wheel with a rod, called an axle,
through its center lifts or moves loads.
Wedge
A wedge is an object with at least one slanting
side ending in a sharp edge, which cuts material apart.
1
THE END
Full transcript