Science · Year 2 · Uses of Everyday Materials · Spring Term

Changing Shapes of Materials

Investigating how the shapes of solid objects can be changed by squashing, bending, twisting, and stretching.

• National Curriculum Attainment Targets
• KS1: Science - Uses of Everyday Materials

About This Topic

Year 2 students explore how solid materials change shape through squashing, bending, twisting, and stretching. They handle everyday items such as playdough, rubber bands, wooden sticks, straws, and wire to observe and compare reactions. Soft materials like plasticine squash and reform easily, while rigid ones like pencils bend slightly then snap. This matches the UK National Curriculum's emphasis on everyday materials and their properties.

Students predict outcomes, test ideas, and explain differences, for instance why a rubber band stretches and returns but a twig breaks. These steps develop key skills: making observations, conducting simple comparative tests, and using results to draw conclusions. The topic links to design and technology through selecting materials for strength or flexibility in simple constructions.

Active learning suits this topic perfectly since direct handling of materials provides immediate feedback on properties. Collaborative testing and prediction discussions help students refine ideas through peer evidence, making abstract concepts like elasticity concrete and memorable.

Key Questions

1. Compare how different materials react to being squashed.
2. Explain why a rubber band stretches but a wooden stick breaks.
3. Predict which materials can return to their original shape after being bent.

Learning Objectives

• Compare how different solid materials change shape when subjected to forces like squashing, bending, and twisting.
• Explain why some materials return to their original shape after being deformed, while others do not.
• Predict the outcome of applying specific forces to different materials based on their observed properties.
• Classify materials based on their ability to be stretched, bent, or twisted without breaking.

Before You Start

Properties of Solids

Why: Students need to identify objects as solids before exploring how their shapes can be changed.

Introduction to Forces

Why: Understanding that pushing and pulling are forces is foundational to comprehending how these forces change shapes.

Key Vocabulary

Squash	To press something so that it becomes flat or loses its shape.
Bend	To curve or cause to curve without breaking.
Twist	To turn or wrench something so that its shape is changed.
Stretch	To make something longer by pulling it.
Elastic	Able to spring back into shape after being stretched or compressed.
Rigid	Unable to bend or be forced out of shape; not flexible.

Watch Out for These Misconceptions

Common Misconception

All solid materials change shape in the same way.

What to Teach Instead

Children often expect playdough and wood to squash alike. Station rotations let them test multiple materials side-by-side, revealing differences through direct comparison. Group discussions then clarify properties like rigidity versus flexibility.

Common Misconception

Once a material changes shape, it stays changed forever.

What to Teach Instead

Students assume bent straws or stretched bands are permanently altered. Repeated testing shows elastic recovery, while peer demos of snapping twigs highlight breakage. Prediction charts help track reversible changes.

Common Misconception

Only soft materials can change shape at all.

What to Teach Instead

Some think hard items like pencils never bend. Gentle whole-class tests with various forces correct this, as students observe slight bends before breaks. Shared recordings build accurate models.

Active Learning Ideas

Rotation Stations: Four Forces

Prepare four stations with materials for squashing (playdough, sponge), bending (straws, rulers), twisting (rubber bands, pipe cleaners), and stretching (elastic, wire). Small groups spend 8 minutes at each, predicting changes, testing, and noting if shapes return. Conclude with whole-class sharing of findings.

45 min·Small Groups

Prediction Chart: Stretch or Break?

Provide a class chart with materials like rubber bands, sticks, and foil. Pairs predict reactions to stretching or bending, test gently, then mark results and explain why. Discuss surprises as a group to reinforce elasticity.

30 min·Pairs

Material Hunt and Test

Students collect classroom items, sort into flexible or rigid, then test by squashing or twisting in pairs. Record changes in simple tables. Share one example per pair to build a class properties list.

35 min·Pairs

Squash and Reform Challenge

Give each small group modelling clay and tools. Challenge them to squash, twist, then reform into shapes, noting ease of return. Vote on best reversible material and explain choices.

25 min·Small Groups

Real-World Connections

• Toy designers use materials like plasticine and rubber to create toys that can be squashed, stretched, and reformed, providing interactive play experiences for children.
• Engineers designing bridges and buildings must understand how materials like steel and concrete bend or deform under stress to ensure structural integrity and safety.
• Clothing manufacturers select elastic fabrics for sportswear, allowing garments to stretch and move with the wearer during physical activity.

Assessment Ideas

Exit Ticket

Give each student a small piece of playdough and a paperclip. Ask them to draw two ways they can change the shape of the playdough and one way they can change the shape of the paperclip. Then, ask them to write one sentence explaining why the playdough is easier to change.

Discussion Prompt

Present students with a rubber band and a wooden ruler. Ask: 'What do you predict will happen if I try to stretch both of these? Why do you think they will react differently? What words can we use to describe how they change shape?'

Quick Check

During a hands-on activity, observe students as they test materials. Ask individual students: 'Show me how you can squash this material. Can it bend? Can it twist? What do you think will happen if you stretch it further?'

Frequently Asked Questions

What everyday materials work best for teaching changing shapes in Year 2?

Use playdough or clay for squashing, rubber bands and elastic for stretching, straws and pipe cleaners for bending or twisting, and wooden sticks or pencils for snapping examples. These are safe, cheap, and familiar, allowing clear comparisons of elasticity and strength. Include foil or card for varied responses, and always supervise to prevent injury.

How do I help Year 2 students predict material changes?

Start with class demos of squashing a sponge versus a block, then have pairs predict for new items on charts. Test immediately and compare results. This builds confidence in using prior observations, aligning with curriculum skills for fair testing and evidence-based conclusions.

How does changing shapes link to other Year 2 science topics?

It connects to 'Uses of Everyday Materials' by exploring properties for suitability, and extends to plants or animals through flexible structures like stems. In design technology, students apply ideas when choosing materials for models, reinforcing observation and prediction across the curriculum.

How can active learning help Year 2 students grasp changing shapes of materials?

Active approaches like hands-on stations and prediction tests give direct sensory experience of forces on materials, far beyond diagrams. Small group rotations encourage talk about observations, correcting ideas through evidence. This makes properties tangible, boosts engagement, and develops skills like comparing and explaining, as students see rubber snap back versus wood break.