Scientific Inquiry and the Natural World · 5th Class

Active learning ideas

Friction: Resistance to Motion

Active learning helps students grasp friction because they must see, touch, and measure resistance themselves. When students push objects across different surfaces, they directly observe how texture and weight change motion, building an intuitive understanding that textbooks alone cannot provide.

• NCCA Curriculum Specifications
• NCCA: Primary - Energy and Forces
• NCCA: Primary - Forces

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Inquiry Circle
• 45 min · Small Groups

Fair Test: Ramp Sliders

Construct identical ramps from cardboard. Cover surfaces with foil, fabric, and sandpaper. Release same-weight blocks from the top, measure travel distance on the floor below. Groups chart results and identify the highest-friction material.

Explain how surface texture influences the amount of friction.

Facilitation Tip

During the Fair Test: Ramp Sliders, remind students to keep the ramp angle and block type constant while changing only the surface material.

What to look for

Provide students with a small block and access to three different surfaces (e.g., sandpaper, smooth wood, carpet). Ask them to write down which surface created the most friction and why, based on their observations of how hard it was to push.

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

Activity 02

• Inquiry Circle
• 30 min · Pairs

Friction Survey: Classroom Walkabout

Pairs test friction by sliding erasers or coins across desks, floors, and mats. Rate surfaces from low to high friction, photograph examples, and discuss one benefit and one drawback per surface. Share findings class-wide.

Analyze situations where friction is beneficial and where it is detrimental.

Facilitation Tip

For the Friction Survey: Classroom Walkabout, assign small groups to specific areas so the whole room is covered efficiently.

What to look for

Pose the question: 'Imagine you are designing a playground slide. Would you want more or less friction on the sliding surface? Explain your reasoning, considering safety and fun.'

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

Activity 03

• Inquiry Circle
• 40 min · Small Groups

Design Challenge: Best Brakes

Roll marbles down a gutter. Groups test stopping methods using cloths, rubber bands, or hands on a flat track. Time distances to stop, refine designs based on trials, and present most effective brake.

Design an experiment to compare the friction of different materials.

Facilitation Tip

In the Design Challenge: Best Brakes, provide a range of materials but limit the size of each so students focus on function over quantity.

What to look for

Show students images of different objects in motion (e.g., a car braking, ice skaters, a conveyor belt). Ask them to identify one situation where friction is helpful and one where it is a problem, and briefly explain why.

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

Activity 04

• Inquiry Circle
• 35 min · Pairs

Lubricant Investigation: Oily Slides

Compare dry and oiled surfaces by sliding blocks on trays. Apply soap water or oil to half, measure speeds. Predict and record changes, explaining how lubricants reduce friction.

Explain how surface texture influences the amount of friction.

Facilitation Tip

During the Lubricant Investigation: Oily Slides, ask students to predict which oil will work best before testing and record the reasoning in their notebooks.

What to look for

Provide students with a small block and access to three different surfaces (e.g., sandpaper, smooth wood, carpet). Ask them to write down which surface created the most friction and why, based on their observations of how hard it was to push.

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

A few notes on teaching this unit

Teachers should introduce friction as a force students can control and measure, not just an abstract concept. Avoid overemphasizing weight as the only variable; instead, let students discover through experiments that surface texture often matters more. Research shows hands-on investigations build stronger mental models than lectures, so prioritize time for testing and discussion over explanation.

Successful learning looks like students confidently explaining why a rough surface slows movement more than a smooth one and identifying useful versus harmful friction in real-world examples. They should cite evidence from their experiments, not just repeat ideas from instruction.

---

Watch Out for These Misconceptions

• During the Fair Test: Ramp Sliders, watch for students assuming friction always hurts motion. Redirect by asking them to compare how difficult it is to slide a block on sandpaper versus polished wood, then discuss examples like walking or braking where friction is necessary.

  During the Fair Test: Ramp Sliders, have students rank surfaces by friction and then brainstorm uses where each amount of friction is helpful or harmful, linking their findings to real machines and tools.

• During the Friction Survey: Classroom Walkabout, watch for students believing smoother surfaces create more friction. Redirect by asking them to test a tile floor versus a carpeted area with the same small block and compare push forces.

  During the Friction Survey: Classroom Walkabout, collect data on surface textures and have groups present why rough textures increase friction, using their own measurements as evidence.

• During the Design Challenge: Best Brakes, watch for students thinking friction depends only on weight. Redirect by providing identical blocks with different base materials and asking them to explain why the lighter block might still resist motion more.

  During the Design Challenge: Best Brakes, ask students to test two identical blocks on the same surface but with one block wrapped in foil to change its contact area, then discuss why weight isn't the only factor.

---

Methods used in this brief

• Inquiry Circle