Science · Grade 5

Active learning ideas

Beneficial and Harmful Friction

Students need to feel friction to truly understand it, not just read about it. Active experiments let them compare rough and smooth surfaces, test different shoes on ramps, and measure how brakes slow motion. This hands-on approach builds intuition about how friction helps or hinders movement in real life.

• Ontario Curriculum Expectations
• 3-PS2-2

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Friction Testing Stations

Prepare stations with ramps and toy cars on surfaces like sandpaper, wax paper, cloth, and lubricated wood. Students slide cars, measure distances, and record which surface increases or decreases friction. Groups rotate every 10 minutes to compare data.

Justify why friction is both a helpful and hindering force in daily life.

Facilitation Tip

At the Friction Testing Stations, remind students to use consistent weights and angles when sliding objects to make comparisons fair and measurable.

What to look for

Provide students with a scenario, such as 'A child is trying to slide down a playground slide.' Ask them to write two sentences explaining how friction is involved, identifying if it is helpful or hindering in this case, and suggesting one way to change the amount of friction.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Formal Debate
• 30 min · Pairs

Pairs: Ramp Modification Challenge

Partners build ramps from cardboard and test sliders on smooth versus rough inclines. They apply soap or sand to alter friction, time descents, and predict outcomes before testing. Discuss which changes best mimic real designs like snowy roads.

Analyze how engineers design objects to either increase or decrease friction.

Facilitation Tip

For the Ramp Modification Challenge, encourage pairs to sketch their ramp changes and predict how they will affect a toy car’s speed before testing.

What to look for

Hold up or show images of common objects (e.g., sandpaper, a bicycle brake, a slippery floor, ski wax). Ask students to give a thumbs up if friction is primarily helpful for the object's function, and a thumbs down if it is primarily hindering. Follow up by asking a few students to justify their choices.

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

Activity 03

• Formal Debate
• 35 min · Whole Class

Whole Class: Brake Design Demo

Demonstrate bike brake effectiveness on different surfaces using a model bike. Class votes on modifications like adding rubber pads, tests them collectively, and graphs stopping distances. Relate findings to safety engineering.

Critique common methods for reducing friction in machines.

Facilitation Tip

During the Brake Design Demo, have students time how long it takes for a wheel to stop with and without brake pads to collect clear data.

What to look for

Pose the question: 'Imagine you are designing a new type of shoe for athletes. What would be your main considerations regarding friction, and why?' Facilitate a class discussion where students share ideas about surface materials, tread patterns, and the balance between grip and ease of movement.

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

Activity 04

• Formal Debate
• 25 min · Individual

Individual: Everyday Friction Audit

Students list 10 household items, classify friction as helpful or harmful, and sketch one improvement like lubricating a sticky drawer. Share audits in a gallery walk for peer feedback.

Justify why friction is both a helpful and hindering force in daily life.

Facilitation Tip

In the Everyday Friction Audit, remind students to focus on one object at a time and measure the difference before and after adding lubricant.

What to look for

Provide students with a scenario, such as 'A child is trying to slide down a playground slide.' Ask them to write two sentences explaining how friction is involved, identifying if it is helpful or hindering in this case, and suggesting one way to change the amount of friction.

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

A few notes on teaching this unit

Teach this topic by letting students experience friction firsthand through structured investigations, then guiding them to connect observations to real-world uses. Avoid long lectures about forces; instead, use quick demonstrations to spark curiosity and follow up with discussions that build conceptual clarity. Research shows that letting students manipulate variables—like surface texture or lubricant type—helps them grasp abstract ideas like energy loss and control.

By the end of these activities, students will explain why friction matters in brakes and shoes, adjust friction with materials like oil and sandpaper, and justify trade-offs between grip and speed. They will use evidence from their tests to support claims about helpful and harmful friction.

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Watch Out for These Misconceptions

• During Station Rotation: Friction Testing Stations, watch for students who assume all friction should be reduced, such as suggesting smooth surfaces are always better for shoes.

  Use the force sensor readings at the stations to show how too little friction makes objects slip uncontrollably, then have students adjust their predictions based on measured grip.

• During Ramp Modification Challenge, watch for students who think friction only happens between solids.

  Ask pairs to test a piece of paper and a feather on their ramp to observe air resistance, then discuss why fluid friction matters in real-life falls and sports.

• During Everyday Friction Audit, watch for students who believe lubricants remove all friction.

  Have students rub oil on a slider and measure how much slower it moves than a dry one, then lead a discussion on why some friction remains for safety and control.

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Methods used in this brief

• Stations Rotation
• Formal Debate