WedgeInclined Plane

Screw

Wheel and Axle

Lever

Pulley

Bellwork:Can you name one simple

machine you used last night before you went to bed? What did you use it for?

Why did you use it?

Bellwork:Give one example of a….

leverpulley

wheel axleinclined plane

wedge screw

Objective:You will describe the six different simple machines (inclined plane, pulley, wedge, screw, lever and wheel & axle and give examples

of each one.

Simple machines are useful because they can make a physical job easier by changing the magnitude or the direction of the force exerted to do work.

Have you ever tried to unscrew a nut, bolt, or screw from something with your bare hands and discovered that it was just too tight to loosen even if you had a good grip?

http://cgl.microsoft.com/clipgallerylive/packages/j007/j0078622.cil

You got the proper tool, such as a screw driver

or wrench,

and unscrewed it!

Why is it that it's so easy to unscrew with a tool when you can't with your bare hands?

The wrench and screw driver are examples of a wheel and axle, where the screw or bolt is the axle and the handle is the wheel. The tool makes the job easier by changing the amount of the force you exert.

Axle

Wheel

All of the simple machines can be used for thousands of jobs

from lifting a 500-pound weight to making a boat go. The

reason why these machines are so special is because they make

difficult tasks much easier.

Fulcrum

Lever

Load

Click Here to Learn More

Click on the dude to learn more.

A screw is an inclined plane wrapped around a post.

Click on the light bulb to learn more.

Two inclined planes make a wedge.

Try to catch the saw to learn more.

Axle

Wheel

Click on the windmill to learn more.

Wheel

Rope This box is easier to lift because of the pulley. Click on it to learn more.

Click above