You will learn
- Define pulley.
- Compare fixed and moving.
- Identify uses.
- Test with light loads.
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
- A pulley changes the direction of a pull.
- A fixed pulley does not reduce effort.
- A moving pulley reduces effort.
- Pulleys are used in wells, flagpoles and cranes.
Words to know
a wheel with a rope round it
a pulley fixed in place that changes direction
a pulley that moves with the load
a machine that lifts heavy loads
1. Discover: The village well
Ama draws water from the well with a bucket on a rope over a wheel. Pulling down lifts the bucket up. “The wheel changes the direction,” she says. “It is easier to pull down than to lift up.”
Think: Why is pulling down easier?
2. Understand: Pulleys
Idea 1: Fixed pulley
A fixed pulley is attached to a support. Pulling down on the rope lifts the load up. The effort is the same size, but direction is easier.
Idea 2: Moving pulley
A moving pulley moves with the load. It shares the weight across two rope parts, so less effort is needed, but more rope must be pulled.
Idea 3: Uses
Wells, flagpoles, window blinds and cranes use pulleys. Systems of several pulleys can lift heavy loads.
3. Worked examples
Example 1 (I show you): Name
Flagpole.
- Rope.
- Wheel.
- Flag up.
Answer: It uses a fixed pulley.
Example 2 (We do it together): Predict
Moving pulley.
- Shares load.
- Less effort.
- More rope.
Answer: Less effort, more rope.
Example 3 (You try): Explain
Well.
Show the steps and answer
- Down pull.
- Bucket up.
- Easier.
Answer: Direction change helps.
Did you know?
The tallest tower cranes can lift loads of over 20 tonnes using systems of pulleys.
Why this matters
Pulleys help lift loads safely on farms, ships and building sites.
4. Explore: Pulley test
Use a spool or toy pulley on a stand to lift a small bag and compare fixed and moving set-ups with a spring balance.
- Set up fixed pulley.
- Lift small bag.
- Set up moving pulley.
- Compare readings.
Think about it: what did you notice?
What did you notice? The moving pulley needed less effort.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- A ___ is a wheel with a rope.
- A ___ pulley is attached in place.
- A ___ pulley moves with the load.
- A ___ lifts heavy loads on sites.
Guided practice
Question 1. What is a pulley?
Wheel and rope.
Question 2. What does fixed do?
Changes direction.
Question 3. What does moving do?
Less effort.
Independent practice
Level 1: Start
- What is a pulley?
- What does fixed do?
- What does moving do?
- Name a use.
- What is a crane?
Level 2: Grow
- Why is moving easier?
- Why more rope?
- Why well pulleys?
Level 3: Stretch
- Build one.
- Compare readings.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why a flagpole uses a pulley.
Show a sample answer
Use direction.
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: Only changes direction.
Fix: They do not.
8. Lesson summary and revision card
- I can define pulley.
- I can compare fixed and moving.
- I can identify uses.
- I can test with light loads.
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
- A pulley changes the direction of a pull.
- A fixed pulley does not reduce effort.
- A moving pulley reduces effort.
- Pulleys are used in wells, flagpoles and cranes.
11. Next lesson
Next lesson: Wheels and axles. 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.
- Define pulley. [2 marks]
- Compare fixed and moving pulleys. [4 marks]
- Name two uses. [2 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- Wheel [1]; rope [1]
- Fixed direction [1]; moving less effort [1]; more rope [1]; example [1]
- 1 each
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is a pulley?
- What does fixed do?
- What does moving do?
- Name a use.
- What is a crane?
- Why is moving easier?
- Why more rope?
- Why well pulleys?
- Build one.
- Compare readings.
Homework
Find a pulley at home or in your community.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is a pulley? | Wheel and rope. | 1 |
| 2. What does fixed do? | Changes direction. | 1 |
| 3. What does moving do? | Less effort. | 1 |
| 4. Name a use. | Flagpole. | 1 |
| 5. What is a crane? | Lifting machine. | 1 |
| 6. Why is moving easier? | Shares load. | 1 |
| 7. Why more rope? | Trade-off. | 1 |
| 8. Why well pulleys? | Pull down. | 1 |
| 9. Build one. | Photo. | 1 |
| 10. Compare readings. | Table. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Wheel and rope.; 2 Changes direction.; 3 Less effort.; 4 Flagpole.; 5 Lifting machine.. Level 2: 1 Shares load.; 2 Trade-off.; 3 Pull down.. Level 3: 1 Photo.; 2 Table.; 3 Sentence..
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 Define pulley | 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 Compare fixed and moving | 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 Identify uses | 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 Test with light loads | 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: “A fixed pulley halves the effort.” Only changes direction.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Explain pulleys.
- 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 tests pulleys. You do not need to be an expert to help.
- Look for pulleys on a well or blind.
- Ask “Which way does it move?”
- Light loads.
- 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: define pulley; compare fixed and moving; identify uses; test with light loads.
Prerequisite knowledge. Grade 3 ideas: forces as pushes and pulls, materials and their properties, and engineering design basics.
Materials. Spool, string, bag, balance. 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. Build a stand.
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). Pull a rope over a rail and ask, “Which way does the load go?”
Explanation (10 min). Teach pulleys.
Guided activity (10 min). Learners test.
Independent activity (10 min). Learners compare.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. Fixed or moving? How much rope?
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. “A fixed pulley halves the effort.” Only changes direction.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-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. Explain pulleys. 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 4 Unit 10, topic 5; Next Generation Science Standards, engineering design; Cambridge Primary Science Stage 4, physics: forces and structures; IB Primary Years Programme, how we organise ourselves and how the world works. These sources informed the lesson.