Bedienungsanleitung Knex 78620 - Education Intro to Wheels and Axles and Inclined Planes Teachers Guide (Seite 44 von 49) (Englisch)

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The path of the spiral is upwards,

just like any inclined plane. The only

difference is that this inclined plane

spirals around the shaft of the drill.

The same inclined plane rules apply.

While the drill bit only moves a short

distance into the wood, the drill bit,

itself, has rotated through a much

greater distance. This requires less

effort than trying to push the drill bit

directly into the wood.

Extension Activity (Optional)

 • UsingtheschoollibraryandInternetthechildren

should investigate the Archimedes’ Screw to learn

about its design and how it worked. Their research

should discover how it was used 2000 years ago and

how it is used to day.

 • Workinginsmallgroups:

Design and make an Archimedes’ Screw, using the

K’NEX kit, that can raise table tennis or small

polystyrene balls from a coffee tin.

The Archimedes’ Screw consists

of a screw inside a cylinder with an

opening at each end and a handle to

turn the screw. When one end of the

screw is lowered into a body of water

and the handle at the other end is

turned, water enters the screw at

the lower end and is moved up the

spiral, exiting at the top end. Today,

Archimedes’ Screws continue to be

used for irrigation purposes when

water must be raised to a higher

level, but they can also be found,

for example, in machines that trans-

fer grain and as devices for removing

rubble from excavation sites.

Augers are a form of Archimedes’

screw. The Combine Harvester makes

use of several Archimedes’ type

screw mechanisms.

Source: American Museum of Natural History

Ask the children to record their observations and results.

Making use of the correct vocabulary, they should write

notes to explain how the mechanism works. They should

also include labelled diagrams, with arrows to show the

direction of movement of the different parts.

wheels and axles and inclined planes

website: www.knexeducation.co.uk

Lesson 7: The Hand Drill

Education

Extension Activity 2 – Design and Make Class Challenge

Working in small groups:

 • Askthechildrentousetheirknowledgeofhowobjects

move up and down inclined planes, to design and make

a system for a table tennis ball to take the longest time

to descend from a height of 30cm.

The groups can use K’NEX kits and any other materials

made available in their classroom.

Plenary

Choose some models to share with the class and ask the

children to describe:

 • Thereasonsbehindtheirdesign.

“We did this because…”

 • Whytheirdesignworkswell.

 • Whatpartsoftheirdesigntheyarepleasedwith.

 • Whatteststheycarriedouttoevaluatetheirdesign

against the design brief?

Useful Internet Site:

www.mcs.drexel.edu/~corres/

Archimedes/contents.html

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