Activity 01
Ramp Testing: Surface Showdown
Cover ramps with four surfaces: sandpaper, cloth, plastic, and foil. Release identical toy cars from the top and measure how far each travels on the floor. Groups chart results, predict outcomes for new surfaces, and discuss patterns in friction levels.
Analyze how surface texture influences the amount of friction.
Facilitation TipDuring Ramp Testing, remind students to keep the ramp angle and object mass the same across trials to isolate friction as the only variable.
What to look forProvide students with a small ramp and three different materials (e.g., sandpaper, cloth, smooth plastic). Ask them to: 1. Predict which material will create the most friction. 2. Briefly explain their prediction. 3. Identify which material they think would be best for stopping a toy car quickly.
ApplyAnalyzeEvaluateSelf-AwarenessSelf-ManagementSocial Awareness
Generate Complete Lesson→· · ·
Activity 02
Car Modification: Reduce the Drag
Provide toy cars, lubricants like soap, and wheels. Pairs predict which modification reduces friction most, test on a track, time the runs, and compare before-and-after data. Share best designs with the class.
Differentiate between surfaces that create high friction and low friction.
Facilitation TipFor Car Modification, provide only basic tools like tape and scissors so students focus on material choices rather than complex building.
What to look forDuring the experiment, ask students to hold up one finger for low friction, two fingers for high friction, after testing an object on a surface. Then, ask: 'Why did you choose that number of fingers?' to gauge their understanding.
ApplyAnalyzeEvaluateSelf-AwarenessSelf-ManagementSocial Awareness
Generate Complete Lesson→· · ·
Activity 03
Stations Rotation: Friction Forces
Set up stations for pulling blocks across surfaces with spring scales, dropping balls into sand versus water, rubbing hands on fabrics, and rolling marbles down inclines. Groups rotate, record force needed or speed, and classify surfaces.
Design a way to reduce friction for a moving object.
Facilitation TipSet a timer for Station Rotation to ensure all groups experience each surface within the same class period.
What to look forPose the question: 'Imagine you are designing a playground slide. What kind of surface would you choose for the main slide, and why? What about the surface around the bottom of the slide, and why?' Listen for student reasoning connecting surface texture to friction and safety.
RememberUnderstandApplyAnalyzeSelf-ManagementRelationship Skills
Generate Complete Lesson→· · ·
Activity 04
Design Challenge: Fastest Slider
Challenge students to build a low-friction slider from cardboard, straws, and tape that travels farthest down a ramp. Test prototypes, measure distances, iterate based on failures, and vote on top designs.
Analyze how surface texture influences the amount of friction.
Facilitation TipBefore the Design Challenge, demonstrate how to adjust ramp height to change speed without altering friction.
What to look forProvide students with a small ramp and three different materials (e.g., sandpaper, cloth, smooth plastic). Ask them to: 1. Predict which material will create the most friction. 2. Briefly explain their prediction. 3. Identify which material they think would be best for stopping a toy car quickly.
ApplyAnalyzeEvaluateSelf-AwarenessSelf-ManagementSocial Awareness
Generate Complete Lesson→A few notes on teaching this unit
Teach friction by letting students experience the concept firsthand rather than starting with definitions. Avoid lecturing about the definition of friction before hands-on work, as this can overshadow their observations. Research shows that students retain concepts better when they first encounter friction through guided experiments and then refine their understanding through discussion and design tasks.
By the end of these activities, students will accurately describe how surface texture affects friction and predict outcomes in new situations. They will use evidence from their experiments to explain why some materials slow motion more than others, showing clear reasoning in discussions and written work.
Watch Out for These Misconceptions
During Ramp Testing, watch for students who assume all surfaces create the same friction. Use the ramp setup to redirect them by asking, 'Why does the object stop sooner on the sandpaper than the glass? What do you notice about the two surfaces?'
Remind students to compare textures directly by feeling each surface and noting differences before testing.
During Car Modification, watch for students who think friction is always harmful. Use the task to redirect them by asking, 'How does the rubber band on the wheel help the car move? What would happen without it?'
Encourage students to test both grippy and slippery modifications and discuss which worked best for speed and control.
During Station Rotation, watch for students who focus only on weight when comparing friction. Use the activity to redirect them by saying, 'Try sliding the same small block on both the carpet and the glass. Does the block’s weight change here, or is something else making it stop faster?'
Ask students to hold the object’s mass constant while changing only the surface to isolate texture as the key factor.
Methods used in this brief