Simple Machines

Inclinedplane

Wheel and axle

wedge

screw

pulley

lever

Types Of Simple Machines

Machines

Machines make work easier.

Machines allow you to use less force to do work.

work and energy video 13:00 min

Levers A lever is a long bar with a support. The fulcrum supports the weight of

the bar and what the bar carries. The object you want to move is called

the load. The effort is a push or pull that

moves the load in some way.

Welcome to Discovery Education Player

(3:23 minutes)

Wheel and Axle

A special kind of lever that moves or turns objects

wheel and axle video 1:36min

Pulley

A pulley is a wheel and axle with a a rope, wire or chain around it.

A pulley changes the direction of force—you pull down on the rope to make the load go up

pulley video 2:53min

Inclined Plane An inclined plane

is the same as a ramp.

Objects can be slid up or down an inclined plane to make the job easier.

inclined plane video 1:28 min

Wedge A special kind of

Inclined Plane Wedges are used

to split things apart

They can also be used to hold things together.

Wedge Video 1:43 min

Screw A screw is also an

inclined plane. If you could unwrap a screw’s threads you could see the inclined place.

Screws fasten things together.

screw video 1:44 min

Complex Machines

Complex Machines are Simple Machines working together.

The handles are levers

The sharp edge is a wedge

Winding the handle is turning a wheel and axle inside

Review video on all simple machines 14:36 min