You will learn
- Compare movement on smooth and rough surfaces.
- Say that friction slows things down.
- Predict which surface is faster.
- Explain why shoes need grip.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Things slide further on smooth surfaces.
- Things stop sooner on rough surfaces.
- Friction slows moving things.
- Rough soles stop us slipping.
Words to know
the top of something
the rubbing force that slows moving things
how well something holds
so smooth that things slide
1. Discover: The wet floor
After rain, the school floor is wet and smooth. Joy slides in her shoes and nearly falls. On the rough path outside, she walks easily. “The wet floor has less grip,” says the teacher. “We must walk slowly.”
Think: Why did Joy slide on the floor?
2. Understand: Surfaces
Idea 1: Smooth and rough surfaces
A toy car rolls far on a smooth surface such as a tile floor. On a rough surface such as grass or sand, it stops sooner. Rough surfaces give more grip.
Idea 2: Friction
Friction is a force that happens when two surfaces rub together. It slows moving things down. There is more friction on a rough surface than on a smooth one.
Idea 3: Staying safe
A wet or oily floor is slippery because it has little friction. We walk slowly and wipe up spills. Shoes with rough soles grip the ground.
3. Worked examples
Example 1 (I show you): Which goes further?
A car on tiles and a car on sand.
- Tiles are smooth.
- Sand is rough.
- The car goes further on tiles.
Answer: The car goes further on smooth tiles.
Example 2 (We do it together): Why wipe spills?
Water on the floor.
- The floor is slippery.
- Less friction.
- We could slip.
Answer: Spills are slippery, so we wipe them.
Example 3 (You try): Choose shoes
For a muddy path.
Show the steps and answer
- Smooth soles slip.
- Rough soles grip.
- Choose rough soles.
Answer: Rough soles grip better.
Did you know?
Ice has very little friction, which is why it is so slippery and why skates glide on it.
Why this matters
Knowing about surfaces helps us avoid slips and choose the right path or shoes.
4. Explore: Surface test
Roll a toy car on different surfaces and measure how far it goes.
- Make a ramp.
- Let the car roll on tile or board.
- Repeat on a towel or carpet.
- Compare distances.
Think about it: what did you notice?
What did you notice? The car goes furthest on the smooth surface.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A smooth surface has ___ friction.
- A rough surface ___ things down.
- A wet floor is ___.
- Rough soles ___ the ground.
Guided practice
Question 1. Which surface is smooth?
Tiles.
Question 2. Which surface is rough?
Sand or grass.
Question 3. What slows things down?
Friction.
Independent practice
Level 1: Start
- Which surface is smooth?
- Which surface is rough?
- What slows things down?
- Is a wet floor slippery?
- What do we do with spills?
Level 2: Grow
- Why does a car stop sooner on sand?
- Why walk slowly on a wet floor?
- Name two rough surfaces.
Level 3: Stretch
- Plan a test of three surfaces.
- Explain why shoes have rough soles.
- Why is ice slippery?
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Where is it slippery near you?
Show a sample answer
Wet floors and muddy paths.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: Surfaces differ in friction.
Fix: Rough surfaces slow things.
8. Lesson summary and revision card
- I can compare movement on smooth and rough surfaces.
- I can say that friction slows things down.
- I can predict which surface is faster.
- I can explain why shoes need grip.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Things slide further on smooth surfaces.
- Things stop sooner on rough surfaces.
- Friction slows moving things.
- Rough soles stop us slipping.
11. Next lesson
Next lesson: Everyday examples of forces. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- What is friction? [2 marks]
- Name a smooth and a rough surface. [2 marks]
- Why do things go further on tiles? [2 marks]
- Why walk slowly on a wet floor? [2 marks]
- Plan a surface test. [3 marks]
Total: 11 marks.
Marking guide and model answers
- A force [1]; slows moving things [1]
- Smooth [1]; rough [1]
- Less friction [1]; smooth [1]
- It is slippery [1]; to avoid falling [1]
- Same ramp [1]; different surfaces [1]; measure [1]
Score guide: 10 to 11 = secure. 7 to 9 = nearly there, revise the parts you missed. Under 7 = work through the lesson again with a grown-up.
Printable worksheet
- Which surface is smooth?
- Which surface is rough?
- What slows things down?
- Is a wet floor slippery?
- What do we do with spills?
- Why does a car stop sooner on sand?
- Why walk slowly on a wet floor?
- Name two rough surfaces.
- Plan a test of three surfaces.
- Explain why shoes have rough soles.
Homework
Test a toy on two surfaces at home. Write which is faster and why.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. Which surface is smooth? | Tiles. | 1 |
| 2. Which surface is rough? | Sand or grass. | 1 |
| 3. What slows things down? | Friction. | 1 |
| 4. Is a wet floor slippery? | Yes. | 1 |
| 5. What do we do with spills? | Wipe them. | 1 |
| 6. Why does a car stop sooner on sand? | More friction. | 1 |
| 7. Why walk slowly on a wet floor? | Not to slip. | 1 |
| 8. Name two rough surfaces. | Sand and grass. | 1 |
| 9. Plan a test of three surfaces. | Same ramp; compare distances. | 1 |
| 10. Explain why shoes have rough soles. | For grip. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Tiles.; 2 Sand or grass.; 3 Friction.; 4 Yes.; 5 Wipe them.. Level 2: 1 More friction.; 2 Not to slip.; 3 Sand and grass.. Level 3: 1 Same ramp; compare distances.; 2 For grip.; 3 Very little friction..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Compare movement on smooth and rough surfaces | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Say that friction slows things down | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Predict which surface is faster | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Explain why shoes need grip | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “All surfaces are the same.” Surfaces differ in friction.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Test a toy on two surfaces. Say which is faster.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child learns that things move differently on smooth and rough surfaces. You do not need to be an expert to help.
- Notice slippery places.
- Ask, “Why do shoes have grip?”
- Wipe up spills together.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: compare movement on smooth and rough surfaces; say that friction slows things down; predict which surface is faster; explain why shoes need grip.
Prerequisite knowledge. None. Learners should be able to look, listen and talk about what they notice.
Materials. Toy cars, a ramp, a towel, a tile or board, a ruler and chalk. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Set up a ramp. Prepare different surfaces. Mark the start.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Tell the wet floor story and ask, “Why did she slide?”
Explanation (10 min). Teach smooth, rough and friction.
Guided activity (10 min). Learners test surfaces.
Independent activity (10 min). Learners discuss safety.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Is it smooth or rough? How far did it go?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “All surfaces are the same.” Surfaces differ in friction.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 11-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Test a toy on two surfaces. Say which is faster. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 1 Unit 7, topic 7; Next Generation Science Standards, motion and stability: forces and interactions; Cambridge Primary Science Stage 1, forces; IB Primary Years Programme, how the world works. These sources informed the lesson.