Squash, Bend, and Twist

Active learning works well for this topic because children need to see, feel, and compare how different materials respond to forces. When students test real objects like plasticine or rubber bands, they connect abstract concepts to concrete experiences, building lasting understanding through touch and observation.

• 2nd Year
• Young Explorers: Investigating Our World
• 4 activities
• 20 min–45 min

Learning Objectives

1. Classify materials as either elastic or brittle based on their response to applied forces.
2. Explain the difference between a temporary deformation and a permanent deformation in solid objects.
3. Predict how changes in material properties would affect everyday objects and classroom environments.
4. Compare the forces required to permanently deform different materials, such as plasticine and wood.
5. Analyze the relationship between material composition and its ability to stretch or snap.

Inquiry Circle

⏱ 45 min·Small Groups

Testing Stations: Force Challenges

Prepare stations with materials like clay, pipe cleaners, and cardboard. Students apply squash, bend, and twist forces, record if changes are temporary or permanent on worksheets. Groups rotate stations, then share findings with the class.

Prepare & details

Differentiate between a permanent and a temporary change to a material.

Facilitation Tip: During Testing Stations, ask students to rotate roles so every child handles materials and records observations, ensuring equity in participation.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Inquiry Circle

⏱ 30 min·Pairs

Prediction Pairs: Snap or Stretch?

Pairs predict outcomes for materials under bending or pulling forces using thumbs-up/down cards. They test predictions, observe snapping or stretching, and discuss why differences occur. Compile class results on a shared chart.

Prepare & details

Explain why some materials snap while others are able to stretch.

Facilitation Tip: For Prediction Pairs, have students justify their choices with evidence from the Testing Stations before revealing results.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Inquiry Circle

⏱ 35 min·Whole Class

Whole Class: Rubber World Simulation

Students act out daily tasks if all materials were rubber-like: try 'squashing' books or 'twisting' chairs with props. Predict and discuss real implications, then vote on pros and cons. Draw before-and-after sketches.

Prepare & details

Predict the implications if all classroom materials suddenly became as flexible as rubber.

Facilitation Tip: In the Rubber World Simulation, pause frequently to ask students to share their observations aloud, creating a shared narrative of the forces at work.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Inquiry Circle

⏱ 20 min·Individual

Individual: Material Diary

Each student selects five classroom objects, applies gentle forces, and notes changes in a personal diary with sketches. Review entries next day to categorize permanent versus temporary shifts.

Prepare & details

Differentiate between a permanent and a temporary change to a material.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Teaching This Topic

Approach this topic through guided inquiry, letting students test materials first before introducing formal terms like elasticity or plasticity. Avoid telling students what to expect; instead, ask them to compare results and draw conclusions together. Research shows young learners grasp these concepts best when they voice their predictions before testing, then reflect on the differences between their ideas and reality.

What to Expect

Successful learning looks like students confidently using terms like squash, bend, and twist to describe temporary and permanent changes. They should compare materials, make accurate predictions, and explain why some objects snap while others stretch or return to their original shape.

Watch Out for These Misconceptions

Common Misconception

During Testing Stations, watch for students assuming all materials change shape the same way under force.

What to Teach Instead

Use the varied materials at the stations to guide students toward noticing differences, such as asking, 'Why does the rubber band stretch but the pencil breaks? What does that tell us about the materials?'

Common Misconception

During Testing Stations, watch for students thinking any shape change to a material is permanent.

What to Teach Instead

After testing elastic bands, ask students to stretch and release them repeatedly, then discuss why the band returns to its original shape each time.

Common Misconception

During Prediction Pairs, watch for students believing forces do not depend on material type for results.

What to Teach Instead

Have students revisit their predictions after testing, then ask them to explain why the same force (twisting) made a straw bend but a metal spoon stay straight.

Assessment Ideas

Exit Ticket

After Testing Stations, provide students with a rubber band, a pencil, and a piece of clay. Ask them to write down one force they could apply to each object and describe whether the change in shape would be temporary or permanent.

Discussion Prompt

After the Rubber World Simulation, pose the question: 'Imagine all the chairs in our classroom suddenly became as flexible as rubber bands. What are two problems this would cause and one way it might be helpful?' Encourage students to share their predictions and reasoning.

Quick Check

During Testing Stations, observe students as they test different materials. Ask individual students: 'Why do you think the straw bent permanently but the rubber band snapped back?' Listen for their explanations of temporary versus permanent changes.

Extensions & Scaffolding

• Challenge students who finish early to design a bridge using straws that must bend without snapping, then test it with weights.
• For students who struggle, provide a sorting mat labeled "Temporary" and "Permanent" with images of materials to categorize after testing.
• Deeper exploration: Have students research how engineers use flexible materials in real-world structures, then present one example to the class.

Key Vocabulary

Elasticity	The ability of a material to return to its original shape after a force is removed. Rubber bands are highly elastic.
Brittleness	The tendency of a material to fracture or break when subjected to stress, rather than deforming. A dry twig is brittle.
Deformation	A change in the shape or size of an object due to an applied force. This can be temporary or permanent.
Plasticity	The ability of a solid material to undergo permanent deformation without breaking. Plasticine is a good example of a plastic material.