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Let's teach! Primary

Lesson 4

How can heat affect us and things around us?

Lesson Plan

Preparation

  • Obtain actual items or provide photographs of some of the materials/objects discussed throughout the lesson.
  • Collect the equipment needed for the investigation sheet.

Curriculum links

  • Australian Curriculum: ACSSU049, ACSHE051, ACSIS053, ACSIS054, ACSIS215, ACSIS058, ACSIS060
  • NSW Curriculum: ST2-8PW-ST, ST2-10ES-S, ST2-1WS-S, ST2-2DP-T
  • VIC Curriculum: VCSSU063, VCSSU056, VCSIS065, VCSIS066, VCSIS067, VCSIS070, VCSIS071, VCSIS072
  • WA Curriculum: ACSSU049, ACSHE051, ACSIS053, ACSIS054, ACSIS215, ACSIS058, ACSIS060

Suggested teaching strategies

Introduction

  • This lesson is best covered after Lessons 1, 2 and 3 of this unit have been completed.
  • Display the digital lesson on your smartboard to introduce how heat affects the things around us.
  • The student summary and worksheet pages should be used together.

Development

  • Provide students with printable versions of the student summary and worksheet. Have students complete the worksheet.
  • Students should work in pairs or a small group to complete the investigation sheet. Photographs of each step could be taken to display. Explanations of what happened to the balloon could be displayed under each step.
  • Allow time for students to predict what will happen before carrying out Steps 2 and 4 on the investigation sheet. Note: Using ice cubes will cause the balloon to deflate quicker than just using cool water.
  • Through questioning and prompts using students’ suggestions relating to their observations, direct them to answer Question 6 in their own words.

Differentiation

  • Complete the investigation sheet as a class, as you perform the experiment in front of the students and discuss the results of each step as you go.

Conclusion

  • Students can share experiments findings as a class and discuss why the balloon might react in different ways to different situations.

Assessment

Worksheet answers

1. Teacher check
2. (a) reverse cycle air conditioner/heater/beanie/blanket/scarf/double-glazed windows (b) reverse cycle air conditioner/double-glazed windows/fan (c) fridge/cooler/vacuum flask (d) oven/vacuum flask/cooler (can be used, but not usually) (e) oven/toaster (f) cooler/vacuum flask/double-glazed windows
3. The liquid in a thermometer and the meatal in expansion joints both expand when heated and contract when cooled.
4. (a) make it change from a solid to a liquid (b) make it change from a solid to a liquid (c) make it change from a liquid to a solid
5. Students should describe the soles of shoes wearing out or the problems caused by friction in the moving parts of machines like bicycles or car engines.

Investigation sheet answers

1. Teacher check
2. Teacher check
3. Depending on the heat of the water, the balloon will start to inflate after a few minutes (or sooner).
4. Teacher check
5. The balloon will deflate.
6. As the air inside the balloon becomes heated in the hot water, it expands and needs more space. This stretches out the balloon. When the bottle is placed in the ice water, the air inside the balloon is cooled, contracts and needs less space, so the balloon deflates.

Student Pages

Science Year 3 Unit 4 Lesson 4 Intro 1
Lesson 4
How can heat affect us
and things around us?
Science Year 3 Unit 4 Lesson 4 Intro 2
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Lesson 4
How can heat affect us
and things around us?
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Science Year 3 Unit 4 Lesson 1 Slide 1

Imagine it is a very hot day.

What are some of the things you could do to make yourself feel cooler?

Science Year 3 Unit 4 Lesson 4 Slide 2

Science – Unit 4 – lesson 4 – hot day

You could wear light clothing, use a fan or air conditioner to cool yourself or have a cool shower or a swim.

You could play in a shady spot outside instead of in the sun.

Science Year 3 Unit 4 Lesson 4 Slide 3

We sweat when we are hot, which helps to cool us down.

Extra water should be drunk to replace the water lost from sweat.

Science Year 3 Unit 4 Lesson 4 Slide 4

There are many appliances, machines and items we use everyday that make us warmer, make us cooler, keep things warm, keep things cool, use heat for cooking or use heat for other reasons.

Science Year 3 Unit 4 Lesson 4 Slide 5

Read through the following list and decide how and why each is used.

Science Year 3 Unit 4 Lesson 4 Slide 6

reverse cycle air conditioner
gas, electric, solar or wood heater
oven
iron
hot water system
fridge
hair dryer
beanie

Science Year 3 Unit 4 Lesson 4 Slide 7

blanket
double-glazed windows
cooler
thermosoven
mittens
kettle
toaster
scarf

Science Year 3 Unit 4 Lesson 4 Slide 8

Can you add to the list?

Science Year 3 Unit 4 Lesson 4 Slide 9

Sometimes, materials can change when they gain or lose heat.

Some materials can change size by expanding when heated or contracting when cooled.

Science Year 3 Unit 4 Lesson 4 Slide 10

Liquid inside a tube thermometer works in this way.
The metal in railway lines and bridges can expand and contract with heat and cold.
They have expansion joints built into them so they won’t buckle in the heat.

Science Year 3 Unit 4 Lesson 4 Slide 11

Materials can change state from a solid to a liquid or a gas when heated or cooled.

Science Year 3 Unit 4 Lesson 4 Slide 12

Science – Unit 4 – lesson 4 – image – steam

Science – Unit 4 – lesson 4 – image – ice

Water can be a liquid when we drink it.

If we boil it in a kettle, some of it comes out of the spout as a gas.

If we freeze water, it becomes a solid.

Science Year 3 Unit 4 Lesson 4 Slide 13

Science – Unit 4 – lesson 4 – image – chocolate bar

Science – Unit 4 – lesson 4 – image – chocolate melted

A block of chocolate can change from a solid to a liquid if heated.

Science Year 3 Unit 4 Lesson 4 Slide 14

Science – Unit 4 – lesson 4 – image – raw egg

Science – Unit 4 – lesson 4 – image – boiled egg

When we boil an egg, the inside changes from a liquid to a solid by heating.

Science Year 3 Unit 4 Lesson 4 Slide 15

When two surfaces are rubbed together, heat is produced by friction.

This can cause problems for us.

Science Year 3 Unit 4 Lesson 4 Slide 16

For example, did you know that the soles of your shoes wear out because of the constant rubbing against the different surfaces you walk on?

Science Year 3 Unit 4 Lesson 4 Slide 17

Problems can occur with the friction between the moving parts in machines such as car engines and bicycles.

Science Year 3 Unit 4 Lesson 4 Slide 18

Oil or grease is used to reduce the friction (and heat) between the moving parts.

Science Year 3 Unit 4 Lesson 4 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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