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Transcript

But first a little review......

Can you define work?

Work means to move an object with force.

I know you know this.......

Why do we use simple machines?

to make work easier

Do you know how machines give us a mechanical advantage?

Machines give us a mechanical advantage

by chaning the amount, speed and direction of the

force.

An inclined is a sloped surface such as ramp.

An inclined plane lets you move something to a higher level more easier then you could lift it.

An inclined plane give you a mechanical

advantage because you use less effort force to raise an object.

Examples of incline planes are:

stairs

wheelchair ramps

ladders

A wedge works when you push on its thickest part. Most wedges have handles to make them

easier to use.

A thin wedge needs less

effort force to cut then

a thick wedge does.

There are two types of wedges

Most wedges are made up of two inclined

planes and are used to split apart objects:

axe, teeth and nail

Other wedges are made up of one inclined

plane and are used to lift or stop objects:

doorstop

A screw holds objects

together.

When the threads on a screw

are close together it take less

effort force to put the screw in the

wood - because the inclinded plane is

longer.....but

we must turn the screw more

times to drive it into the wood.

Examples of screws are:

light bulb

jar

propellers

2000 years ago, a mathematician named Archimedes invented

a screw that could be used to lift water.

Inclined Planes, Wedges and Screws

force

What is an inclined plane?

The less sloped the incline plane is, the less force you need to raise the object.

The disadvantage is you must move the object a greater distance

Wedge: has a thick end

and a thin end; the thin

end is used to lift, hold

or push objects apart.

The wedge was one of

the earlies simple machines

used.

Do you know what these wedges were?

Screw: an inclined plane

wrapped around a central core.

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