Simple MachinesSimple MachinesSimple MachinesSimple Machines

a lesson for:a lesson for:

Lonna Hanson’sLonna Hanson’s

Third Grade Science ClassesThird Grade Science Classes

Lincoln ElementaryLincoln Elementary

IntroductionIntroductionIntroductionIntroduction

Simple machines are machines with few or Simple machines are machines with few or no moving parts.no moving parts.

Simple machines will be our next Science Simple machines will be our next Science unit.unit.

Kinds of Simple MachinesKinds of Simple MachinesKinds of Simple MachinesKinds of Simple Machines

We will be learning about the six simple We will be learning about the six simple machines. They are:machines. They are: 1. Lever1. Lever 2. Inclined Plane2. Inclined Plane 3. Wedge3. Wedge 4. Screw4. Screw 5. Wheel and Axle5. Wheel and Axle 6. Pulley6. Pulley

Energy and WorkEnergy and WorkEnergy and WorkEnergy and Work

Suppose you needed to move an object. Suppose you needed to move an object. You might use tools to help you. Simple You might use tools to help you. Simple machines are tools that use energy to do machines are tools that use energy to do work.work.

Energy is the ability to do work.Energy is the ability to do work. You probably have used several of the six You probably have used several of the six

kinds of simple machines.kinds of simple machines.

What is a Lever?What is a Lever?What is a Lever?What is a Lever?

A hammer is a lever that helps do work.A hammer is a lever that helps do work. Work is done whenever force makes an Work is done whenever force makes an

object move.object move.

What is an Inclined Plane?What is an Inclined Plane?

A ramp is an inclined plane.A ramp is an inclined plane. A ramp helps move objects.A ramp helps move objects. You can use an inclined plane to help move You can use an inclined plane to help move

an object to a higher or lower place.an object to a higher or lower place.

What is a Wedge?What is a Wedge?

A doorstop is a wedge.A doorstop is a wedge. A wedge is a simple machine used to push A wedge is a simple machine used to push

objects apart.objects apart. An ax is a wedge that splits wood.An ax is a wedge that splits wood.

What is a Screw?What is a Screw?

A screw is a simple machine used to hold A screw is a simple machine used to hold objects together.objects together.

Think about your desk.Think about your desk. Does it have screws helping to hold it Does it have screws helping to hold it

together?together?

What is a Wheel and Axle?What is a Wheel and Axle?

A wheel and axle is a simple machine made A wheel and axle is a simple machine made of a rod attached to the center of a wheel.of a rod attached to the center of a wheel.

The axle, or rod, turns when you put force The axle, or rod, turns when you put force on the wheel.on the wheel.

You probably have seen a wheel and axle You probably have seen a wheel and axle on scooters, cars, roller skates, and wagons.on scooters, cars, roller skates, and wagons.

What is a Pulley?What is a Pulley?

A pulley is a simple machine with a wheel A pulley is a simple machine with a wheel and with a rope.and with a rope.

The rope fits around the edge of the wheel.The rope fits around the edge of the wheel. You can use a pulley to move a load up, You can use a pulley to move a load up,

down or sideways.down or sideways.

What This MeansWhat This Means

Simple machines are important to us in our Simple machines are important to us in our daily life.daily life.

They help us do work.They help us do work. They make our lives easier.They make our lives easier.

Next StepsNext Steps

Please write the titles of the six simple Please write the titles of the six simple machines. The titles on the chalkboard will machines. The titles on the chalkboard will guide you.guide you.

Then, we will study the bulletin board Then, we will study the bulletin board examples. Your last task is to draw one examples. Your last task is to draw one example of each type of simple machine example of each type of simple machine beside its title on your paper. beside its title on your paper.

GREAT JOB THIRD GRADERS!

GREAT JOB THIRD GRADERS!