Reducing and Increasing Friction

Active learning lets Year 3 students directly experience friction’s push and pull on objects. When they tilt ramps, spread oils, or texture surfaces, they build lasting memory of how surfaces and substances change motion.

• Year 3
• Science
• 4 activities
• 30 min–45 min

Learning Objectives

1. Compare the effect of different surfaces on the distance a toy car travels.
2. Explain how lubrication reduces friction between moving parts.
3. Design a toy car that minimizes friction to increase speed.
4. Evaluate the role of tire treads in preventing skidding.
5. Identify methods to increase friction for improved grip.

Problem-Based Learning

⏱ 35 min·Small Groups

Ramp Races: Surface Tests

Build a ramp from cardboard. Test a toy car on smooth foil, carpet, and sandpaper surfaces. Measure how far the car rolls each time. Groups predict outcomes first, then compare results on a class chart.

Prepare & details

Analyze how oil helps a machine run smoothly.

Facilitation Tip: During Ramp Races, position a consistent release point for each object so comparisons remain fair and friction differences are clear.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 30 min·Pairs

Lube Lab: Oil vs Soap

Provide toy cars with squeaky wheels. Apply oil, soap, or water to axles. Release cars down a ramp and time their travel. Discuss which lubricant works best and why, recording data in tables.

Prepare & details

Evaluate the importance of tire treads on a car.

Facilitation Tip: In Lube Lab, give each group two small containers of oil and soap so they can feel the difference between the substances before testing.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 40 min·Small Groups

Tread Makers: Grip Challenge

Create model tires from clay on bottle caps. Test on wet and dry surfaces by rolling down inclines. Add treads or patterns, then retest and measure stopping distances. Vote on best designs.

Prepare & details

Design a solution to make a toy car go faster by reducing friction.

Facilitation Tip: For Tread Makers, provide sandpaper, fabric scraps, and rubber strips so every group can prototype multiple textures on the same shoe sole template.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 45 min·Pairs

Speed Design: Friction Fighters

Give students toy cars, wax, tape, and balloons. Challenge them to modify cars to go farthest down a ramp by reducing friction. Test iterations, share successes, and explain changes.

Prepare & details

Analyze how oil helps a machine run smoothly.

Facilitation Tip: Set Speed Design ramps to a fixed angle before the activity so students focus on material choices rather than incline adjustments.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Teaching This Topic

Start with hands-on trials to confront misconceptions right away. Avoid long explanations before testing; students learn best when they first predict, then observe, and finally revise their thinking. Use the language of surfaces, grip, and speed to connect everyday experiences with scientific terms.

What to Expect

Successful learning looks like students predicting outcomes, testing ideas with evidence, and explaining how friction helps or hinders movement in real contexts. They use everyday language to compare surfaces and materials and adjust designs based on what they learn.

Watch Out for These Misconceptions

Common Misconception

During Ramp Races, watch for students who assume smooth surfaces always win the race.

What to Teach Instead

Ask each group to time identical objects on different ramps and rank them by distance traveled, then discuss why some smooth surfaces slowed the objects down.

Common Misconception

During Lube Lab, watch for students who say oil makes surfaces perfectly slippery.

What to Teach Instead

Have students dip their fingers in oil and soap, then rub surfaces to feel the actual grip differences before testing with the cars.

Common Misconception

During Tread Makers, watch for students who think rougher always means more friction.

What to Teach Instead

Set up a mini-incline with different textures so students test grip in pairs and see how some smooth materials outperform rough ones in certain conditions.

Assessment Ideas

Quick Check

After Ramp Races, give students three objects and ask them to predict which will travel farthest. Have them test and record distances, then explain how friction affected each object in a sentence.

Discussion Prompt

During Speed Design, ask students to explain whether they increased or decreased friction for their toy car and why. Listen for use of terms like surface, grip, and speed in their reasoning.

Exit Ticket

After Tread Makers, have students draw one helpful friction example and one that needs reduction, labeling each with a sentence that explains why friction matters or needs to change.

Extensions & Scaffolding

• Challenge: Ask groups to design a ramp surface that makes a toy car travel exactly 60 cm.
• Scaffolding: Provide vocabulary cards with friction, grip, smooth, rough, oil, and tread for students who need language support.
• Deeper exploration: Introduce rolling friction by comparing a wheeled car to a sliding block on the same ramp.

Key Vocabulary

Friction	A force that opposes motion when two surfaces rub against each other.
Lubrication	The process of applying a substance, like oil or grease, to reduce friction between surfaces.
Surface	The outside part or uppermost layer of something, which can be smooth or rough.
Treads	Grooves on a tire or shoe that provide grip and prevent slipping.