Starter quiz
- What do pull forces do?
- move objects further away
- move objects closer ✓
- keep objects in the same position
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- Which of these activities involve a push force?
brushing hair
turning on a switch ✓
walking ✓
- Gravity is the force that attracts or ______ objects to Earth.
- 'pulls' ✓
A seesaw is an example of what type of simple machine or mechanism?- 'lever' ✓
- When you use a lever, what do you call the force used to move an object.
- the push
- the effort ✓
- the pull
- the load
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What is the name given to the thing you lift using a lever?- ' load' ✓
Exit quiz
- A ______ is a simple mechanism or machine, involving a wheel and rope or chain, which is useful for lifting things.
- 'pulley' ✓
What is the word used to describe the force you apply when using a pulley to lift something?- 'effort' ✓
- Which of these images shows a correctly labelled pulley?
- Which of these pieces of equipment can often use pulleys?
seesaw
elevator or lift ✓
garage door ✓
- Which of these pulleys does not change the direction of the effort needed to lift the load?
How does this pulley make it easier to lift the load?- It changes the direction of the effort needed to lift the load. ✓
- It changes the amount of effort needed to lift the load.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A pulley is a simple mechanism or machine, used in everyday life, which is useful for lifting things.
- A pulley often consists of a wheel with a groove, through which a string or rope runs.
- The object you are lifting is called the load, and the force you apply to make an object move is called the effort.
- Some pulleys make it easier because they change the direction of the force needed to lift an object.
- Some pulleys make it easier to lift an object because they decrease the effort or force needed.
Common misconception
All pulleys have the wheel attached to a ceiling.
Examples will be given of different types of simple pulleys.
Keywords
Pull - A pull is a force that brings an object closer.
Pulley - A pulley is a simple mechanism or machine which is useful for lifting things.
Load - The load is the object you are lifting with a simple machine.
Effort - The effort is the force needed to do a job.
Force - A force is a push or a pull. Forces can make objects move, slow down, change direction or change shape.
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