How pulleys can help us | Science | Quizalize & Oak National Academy

Starter quiz

What do pull forces do?
- move objects further away
- move objects closer ✓
- keep objects in the same position
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
What is the name given to the thing you lift using a lever?
- ' load' ✓

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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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.

All pulleys have the wheel attached to a ceiling.

Examples will be given of different types of simple pulleys.

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.