Bedienungsanleitung Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (Seite 34 von 62) (Englisch)

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Teacher’s Notes

To promote the wider use and

application of ICT skills and practices,

the children’s models and work might

be recorded using a digital camera.

 • Askthechildrentodescribeandexplaintheir

observations. To demonstrate how a hockey stick works

they should use labelled drawings, which include the

positions of the fulcrum, effort and load as well as the

direction of the forces that are applied.

 • Howdothepositionsofthefulcrum,effortandload

compare to the other two examples of levers the

children have investigated?

In 3rd Class levers the effort is

positioned between the load and the

fulcrum. This means that 3rd Class

levers are not as efficient as the other

two lever types because the load will

always be further from the fulcrum

than the effort. As a consequence,

a much larger effort is now needed to

move even a small load.

The main advantage of a 3rd Class

lever is its use in making the load

end move very quickly, as happens

in fishing rods, cricket bats, softball

bats, tennis racquets and golf clubs.

See A Quick Guide to Levers for

additional information on the three

types of levers.

Further information is also available

from the following Internet web sites:

www.howstuffworks.com;

www.enchantedlearning.com/physics/

machines/levers.shtml;

www.flying-pig.co.uk

Working in Groups 2-3

 • Remindthechildrenoftheirdesigntask:Toprovide

evidence to help the hockey player in the photograph on

Page 8 of the Building Instructions decide on the type of

stick he needs to improve his hitting capabilities.

 • Discussthetaskwiththechildrenandaskthemhowthey

will set about their investigation.

  •Howwilltheytesttheirdesigns?

  •Whatwilltheytest?

  •Whatwilltheymeasureandrecord?

  •Howmighttheypresenttheirresultswithreferenceto

the original design specification?

  •Discusstheneedtouseafairtestwithwhichto

evaluate their design ideas.

If the children perform their test by

hand then each test hit may be

different. One possible method to

eliminate the variability in the test

and allow an equal strength hit on

each occasion would be to attach

the K’NEX ice hockey stick to a stand

and allow it to swing from a mea-

sured height. The greater the height

from which the ice hockey stick blade

swings, the harder will be the hit on

the ball.

Ask: Do the test balls all need to be

the same weight? If not, how might

this affect their results? How might they

obtain equally weighted paper balls?

3rd Class Lever

Lesson 5: The Ice Hockey Stick

Education

levers and pulleys

website: www.knexeducation.co.uk

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