Science · Year 3

Active learning ideas

Contact Forces in Action

Active learning works because friction is an invisible force students experience daily. Moving, writing, and gripping all rely on contact forces that aren’t always obvious. Hands-on investigations make these abstract ideas concrete so students can measure and compare friction’s effects directly.

• ACARA Content Descriptions
• AC9S4U03

• 20–45 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 45 min · Small Groups

Inquiry Circle: The Ramp Test

Groups set up a ramp and cover it with different materials (sandpaper, silk, bubble wrap, foil). They measure how far a toy car travels after leaving the ramp to determine which surface has the most friction.

Explain how a door opens when you push it.

Facilitation Tip

During The Ramp Test, remind students to use the same car and push with similar force each time to isolate surface texture as the variable.

What to look for

Provide students with a toy car and ramps covered in different materials (e.g., sandpaper, felt, smooth plastic). Ask them to push the car down each ramp and record how far it travels. Then, ask: 'Which surface created the most friction? How do you know?'

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

Activity 02

• Simulation Game
• 30 min · Small Groups

Simulation Game: Shoe Designer

Students examine the soles of different shoes (sneakers, ballet flats, footy boots). They must 'pitch' a shoe design for a specific surface, like an icy path or a muddy field, explaining how the friction will help.

Compare the force needed to pull a toy car versus pushing it.

Facilitation Tip

In Shoe Designer, circulate and ask groups to explain how the tread pattern they chose will affect friction before they test it virtually.

What to look for

Present students with images of everyday objects or activities (e.g., opening a door, a person walking, a book sliding on a table). Ask: 'What contact forces are being used in this picture? Is friction helping or hindering the action? Explain your reasoning.'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: A World Without Friction

Students imagine a world where all friction suddenly disappeared. They think of one thing that would be impossible to do, share with a partner, and draw a 'frictionless' disaster scene.

Design an experiment to measure the force required to move different objects.

Facilitation Tip

For A World Without Friction, provide sentence starters like ‘Without friction, walking would be like…’ to guide students’ thinking.

What to look for

Students draw a simple diagram showing a push or a pull. They label the force and write one sentence describing how friction might affect the object's movement in their drawing.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

A few notes on teaching this unit

Start with a quick demonstration of sliding different objects on the same surface to introduce the idea that friction isn’t just about weight. Avoid explaining all the variables at once; let students discover the relationship between surface texture and friction through guided trials. Research shows students grasp friction better when they experience it kinesthetically and then articulate their observations in words.

Successful learning looks like students predicting outcomes, testing variables, and explaining results with evidence. They should connect the texture of a surface to friction levels and apply these ideas to real-world scenarios like walking or biking. Group discussions should include reasoning beyond just ‘rough equals more friction.’

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Watch Out for These Misconceptions

• During The Ramp Test, watch for students who assume a heavier block will always slide slower regardless of the surface.

  Provide two blocks of different weights but the same material. Have students test both on the same ramp to show that while weight increases friction, the surface texture has a stronger effect on motion.

• During Shoe Designer, watch for students who think friction only creates heat and ignore its role in stopping movement.

  Ask students to compare the virtual shoe’s performance on dry versus icy surfaces. Prompt them to explain how friction helps the shoe grip the ground to prevent slipping, not just generate warmth.

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Methods used in this brief

• Inquiry Circle
• Simulation Game
• Think-Pair-Share