What would the world be like without

inclined planes?

Simple Machines

Simple Machines

A tool used to make work easier. Simple tools used to make work easier.

Inclined Plane

A slanted (angled) plane Permits us to overcome a large

resistance by applying a relatively small force to the object.

Wedge

A type of inclined plane where we use the pointed edges to do other kinds of work.

We use it to push things apart

Screw

An inclined plane wrapped around a cylinder.

It is another kind of inclined plane. Provides very large mechanical

advantage in minimum space

Lever

Any tool that pries something loose is a lever.

Has an arm that pivots against a fulcrum

3 classes of levers

First Class Lever The fulcrum is located at some point

between the effort and resistance arms.

Always changes the direction of the force

Ex: Scissors, pliers, see saws

2nd Class Lever

The resistance is located between the fulcrum and the effort force

Does not change the direction of the force

Ex: wheel barrow› Bottle openers

3rd Class Lever The effort or force is applied

between the fulcrum and the resistance force

Does not change the direction of the force but produces a gain in speed and distance and decrease in force

Pulley

A cord wraps around a wheel. As the wheel rotates, the cord moves in either direction.

Use the wheel’s rotation to lower and raise objects.

Wheel and Axle

Moves objects across distances. The wheel, turns the axle, causing

movement. Allows for easy movement of objects.

Mechanical Advantage