Manual Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (page 5 of 62) (English)

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A�Quick�Guide�to�Levers

5C: ‘Moving Toys’ and 6C: ‘Fairground’: and

in Science Units 1E: ‘Pushes and Pulls’; 2E:

‘Force and Movement’; 6E: ‘Balanced and

Unbalanced Forces’.

In addition, working with levers helps children

relate science to the ways familiar machines

work.

What is a lever?

A lever is a rigid beam, bar or rod that is able

to turn or rotate about a fixed point called the

fulcrum. For example:

In the curriculum, the concept of levers may

be used in designing and making activities

associated with the QCA/DfEE Exemplar

Scheme of Work for Design and Technology

Units 1A: ‘Playgrounds’; 1D: ‘Moving Pictures’;

3C: ‘Moving Monsters’; 4B: ‘Storybooks’;

The key parts of a lever are:

 • Fulcrum - a fixed point that allows the

beam to rotate around it and can occur

at any point along the lever. It can be in

the centre, as in a seesaw and a simple

balance; off centre, as in a beam balance

and claw hammer; or at one end, as in

the hinge on a door, nutcrackers and

tweezers.

It is thought that levers have been in use since

prehistoric times. They were most likely used

to help people lift and move heavy rocks in the

Palaeolithic era, to build megalithic structures

such as Stonehenge in the Neolithic period,

and were the basis of the balances used by

early traders and merchants to weigh gold

and other valuable trade goods. Today they

are found in many commonly used devices

such as scissors, pliers, stapling machines,

tweezers, and nutcrackers. Even cricket bats,

hockey sticks, tennis racquets and JCB™

excavating machines use the principle of

levers to make them work.

Fig. 1

Education

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Manual

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