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Let's teach! Primary

Lesson 1

What is heat and how is it produced?

Lesson Plan

Preparation

  • Provide pictures or actual items of some of the objects/appliances discussed throughout the lesson. (Students could instead identify heat-producing appliances in their classroom and school.)
  • Collect the equipment needed for the investigation sheet: water (if a tap is unavailable, a bucket can be used), carpet and hand lotion.

Curriculum links

  • Australian Curriculum: ACSSU049, ACSHE051, ACSIS055, ACSIS057, ACSIS058, ACSIS060
  • NSW Curriculum: ST2-8PW-ST, ST2-10ES-S, ST2-1WS-S, ST2-2DP-T
  • VIC Curriculum: VCSSU063, VCSSU056, VCSIS066, VCSIS068, VCSIS069, VCSIS071, VCSIS072
  • WA Curriculum: ACSSU049, ACSHE051, ACSIS055, ACSIS057, ACSIS058, ACSIS060

Suggested teaching strategies

Introduction

  • Display the digital lesson on your smartboard to introduce the concept of heat.
  • The student summary and worksheet should be used together.

Development

  • Provide students with printable versions of the student summary and worksheet. Have students complete the worksheet.
  • Students should work individually or in pairs to complete the investigation sheet. However, ensure that each student completes the experiments and discusses any discrepancies in the results. Also discuss what makes the test fair; e.g. rubbing hands 20 times at the same speed, allowing hands to ‘cool down’ before commencing the next activity, ensuring the water used to rub hands together is the same temperature, ensuring the hand lotion is the same amount and type.

Differentiation

  • Complete the investigation sheet as a class, discussing the results of each test as you do them and seeing if the students can reach the same conclusion.

Conclusion

  • Discuss as a class the different results of each experiment.

Assessment

Text page answers

Most children will not give ‘gas’ for an answer. Many will say ‘liquid’ because when sand is dry, it purs out of a container like a liquid. The answer is ‘solid’. Each little grain of sand is a solid. The same happens when you pour cereal out of a packet. But each piece of cereal is also a solid.

Worksheet answers

1. Matter is anything that takes up space and has mass (weight).
2. (a) liquid, (b) gas, (c) solid, (d) liquid
3. They all have mass/They all take up space
4. (a) Yes, (b) No, (c) No, (d) No, (e) No, (f) Yes
5. (a) packed together tightly, hardly move, (b) close together, always moving around each other, (c) far apart, spread out to fill up the space
6. Possible answers: sugar, flour, rice, nuts, pepper

Science as Human Endeavour question

Possible answers: car tyre, bike tyre, gas over, gas barbecue, bicycle pump, gas hot plates, gas hot water system

Experiment worksheet

1. Students should say the cup is light/hardly weighs anything. Its weight should just register on the scales.
2. Students should predict the cup would feel heavier and measuring will prove that.
3. Measuring will show the cup with the solid (eraser) is heavier.
4. The inflated ball will be slightly heavier than the deflated ball because it is now filled with air.
5. Answers should indicate that solids, liquids and gases have weight.

Student Pages

Science Year 3 Unit 4 Lesson 1 Intro 1
Lesson 1
What is heat and how is it produced?
Science Year 3 Unit 4 Lesson 1 Intro 2
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Lesson 1
What is heat and how is it produced?
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Science Year 3 Unit 4 Lesson 1 Slide 1

Heat is a form of energy or power.

Anything that gives off heat is a source of heat.

Science Year 3 Unit 4 Lesson 1 Slide 2

The sun is the first source of heat most people think of.

We feel its heat, specially on a hot day.

This enormous ball of very hot gases produces a tremendous amount of heat (and light).

Science Year 3 Unit 4 Lesson 1 Slide 3

However, only a small portion of the sun’s heat reaches Earth.

If Earth was closer to the sun, it would be too hot over the entire planet for people to survive.

Science Year 3 Unit 4 Lesson 1 Slide 4

Fire is another source of heat. It is not known when fire was first used by people for warmth (and light and cooking).

The first fires were probably from lightning strikes.

Science Year 3 Unit 4 Lesson 1 Slide 5

Long ago, people learnt
to make fire by rubbing
two sticks together.

This rubbing action made glowing wood dust.

If the dust fell onto a pile of dry leaves and tiny bits of wood, a fire could be started.

Science Year 3 Unit 4 Lesson 1 Slide 6

Science – Unit 4 – Lesson 1 – image – Flint

Later, people discovered that striking a stone called flint against a harder rock containing iron produced sparks.

Science Year 3 Unit 4 Lesson 1 Slide 7

Apart from wood, other fuels have been discovered that can be burnt to produce heat.

Science – Unit 4 – Lesson 1 – image – gas

Science Year 3 Unit 4 Lesson 1 Slide 8

Science – Unit 4 – lesson 1 – image – hands

On a cold day, have you ever rubbed your hands together
to try to get them warm?

This source of heat comes
from friction.

This is the same method used by people long ago to make fire.

Science Year 3 Unit 4 Lesson 1 Slide 9

When two surfaces are rubbed together, heat is produced.

The rougher the surfaces, the more heat is produced.

Also, the greater the speed the surfaces are rubbed together, the greater the heat produced.

Science Year 3 Unit 4 Lesson 1 Slide 10

Try rubbing your hands together slowly.

Then try rubbing your hands together quickly.

What do you notice?

Science Year 3 Unit 4 Lesson 1 Slide 11

Today, electricity is a common source of energy used to produce heat.

Electricity is used to heat up water in kettles or in hot water systems.

Science Year 3 Unit 4 Lesson 1 Slide 12

It is used to heat up irons, cook food in ovens and toast bread in toasters.

Many types of heaters work by electricity.

Science – Unit 4 – Lesson 1 – image – kitchen appliances

Science Year 3 Unit 4 Lesson 1 Slide 13

Other appliances in your home can still feel warm, even though their purpose is not for heating.

Science Year 3 Unit 4 Lesson 1 Slide 14

Put your hand on the back of a fridge, computer or television after it has been turned on for a while.

You will feel heat as some is produced in making the appliance work.

Science Year 3 Unit 4 Lesson 1 Final Slide
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Downloads

Student Summary

Summary of student page information

Worksheet

Activities for students to complete

Investigation Worksheet

An experiment to consolidate learnings

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