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Knex 78620 - Education Intro to Wheels and Axles and Inclined Planes Teachers Guide Manual

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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.
43
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
… 44 …


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