Forces and Gravity: Levers, Pulleys and Gears — Year 5 Lesson Plan
National Curriculum: Science — Forces, Year 5: recognise that some mechanisms, including levers, pulleys and gears, allow a smaller force to have a greater effect
Overview
The last of five Forces and Gravity lessons. Pupils explore mechanisms that let a smaller force have a greater effect. They use a ruler lever to lift a weight and find how moving the pivot changes the effort needed, see how pulleys can change the direction of a force and make lifting easier, and find out how gears change speed and turning force.
Forces and Gravity: Levers, Pulleys and Gears learning objectives
- Recognise that levers, pulleys and gears allow a smaller force to have a greater effect.
- Describe how the position of the pivot (fulcrum) changes the force needed to lift a load with a lever.
- Explain how a pulley can change the direction of a force, and how more pulleys make a load easier to lift.
- Describe how gears of different sizes change how fast and how strongly something turns.
Success criteria
- I can explain how a lever lets a small force lift a bigger load.
- I can describe what a pulley does.
- I can describe how gears of different sizes change speed and turning force.
- I can give an everyday example of each mechanism.
Key Vocabulary
Suggested Lesson Structure
Show pictures of a see-saw, a crane, a bicycle and a tin being opened with a spoon handle. Ask: how do these make jobs easier? Pupils discuss what the pictures have in common.
Explain that mechanisms let a small force have a bigger effect. A lever is a bar that turns about a pivot: the further the effort is from the pivot, compared with the load, the less effort is needed, but the effort end moves further. A single fixed pulley changes the direction of the force, so you pull down to lift up; using two or more pulleys together means less effort is needed, but more rope must be pulled. Gears pass turning from one wheel to another: when a small gear turns a large gear, the large gear turns more slowly but with more turning force, and gears that mesh turn in opposite directions.
Carousel of three stations. Levers: balance a 30 cm ruler on a pencil as the pivot, put a load of coins at one end, and press the other end with a finger; move the pivot and compare how hard it is to lift. Pulleys: lift a bag with a single pulley, then with two pulleys, and measure the effort with a newton meter. Gears: turn gear sets (or bicycle gears) and count how many turns the small gear makes for one turn of the large gear.
Pupils complete a table for each mechanism: what it does, an everyday example and how it makes a job easier. Challenge: plan a product, such as a moving card or a toy, that uses a lever, pulley, gear or spring, and explain how it works.
Whole-unit quiz on mini whiteboards: What pulls unsupported objects towards the Earth? Which force slows a parachute? Why are boats streamlined? When is friction useful? How does a lever make lifting easier? Pupils mark their own answers.
Support and extension for forces and gravity: levers, pulleys and gears
Support
- Label the lever station with picture cards: pivot, load, effort.
- Start with a see-saw in the playground before using the ruler lever.
- Give a table with the everyday examples filled in, for pupils to explain.
Extension
- Plan and make a moving card or toy that uses a lever, pulley, gear or spring.
- Explain why a long spanner makes it easier to undo a tight nut.
- Count the teeth on two gears and predict how many turns the small gear makes for one turn of the large gear.
Check for understanding
Quick questions for the plenary or an exit ticket. Tap a question to see the answer.
1. What is the pivot of a lever?
Answer: The fixed point it turns around (the fulcrum).
2. How can you make it easier to lift a load with a lever?
Answer: Move the pivot closer to the load, or push further from the pivot.
3. What does a single fixed pulley do?
Answer: It changes the direction of the force: you pull down to lift up.
4. A small gear turns a large gear. What happens to the large gear?
Answer: It turns more slowly, but with more turning force, and in the opposite direction.
Resources you will need
- 30 cm rulers, pencils as pivots, coins or small weights
- Pulleys, string, a bag with a load and a newton meter
- Gear sets or a bicycle
- Pictures of a see-saw, crane, bicycle and tin opener
- Mechanism table for the independent task
Common Misconceptions
- Mechanisms create extra energy or do the work for you. They let a smaller force have a bigger effect, but the effort has to move further.
- The pivot of a lever is always in the middle. It can be anywhere; moving it closer to the load means less effort is needed.
- A single pulley makes a load lighter. One fixed pulley only changes the direction of the force; it takes several pulleys to reduce the effort.
- Gears that mesh turn the same way. Two gears that mesh turn in opposite directions.
Prior Knowledge
Pupils should already be able to:
- Know that forces are pushes and pulls, measured in newtons (lesson 1).
- Use a newton meter (lessons 1 and 4).
- Have seen everyday machines such as bicycles and see-saws.
Make it yours
Want a personalised version of this lesson?
Use Staffroom to generate a complete lesson plan tailored to your class — add context about ability, recent learning, or specific pupils and get a plan ready to teach. Free plan, no card required.