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wheels and axles and inclined planes
website: www.knexeducation.co.uk
Lesson 6: The Splitting Wedge
 • Explaintotheclasshowthesetoolsarealsoexamples
of inclined planes.
 • Drawtheprofilesofthedifferenttoolsontheboardand
compare their shapes to the inclined plane investigated
previously. For example:
Knife blade.
Axe head: Two inclined
planes back-to-back.
Scissors: Two inclined
planes moving in
opposite directions
across each other.
Teacher’s Notes
A wedge used in a cutting tool acts
like a moving inclined plane. Instead
of the object being moved up the
inclined plane, the plane itself makes
the object move.
The same principle applies: the
wedge moves a greater distance
into the object than the sideways
movement of the cut side. The
sideways cutting forces, therefore,
are greatly increased.
Optional Activity
 • Askthechildrentofindexamplesofmachinesthat
use inclined planes or wedges in their mechanisms.
They should describe and explain how they work,
using labelled drawings and text. For example: zip
fasteners, ploughs and locking systems. You may
want to suggest that they investigate how a wedge
is used to ‘lock’ the wooden handle into the
metal head of a hammer or axe.
Let’s Investigate – How Wedges Work!
Working in Groups of 2-3
 • AskthechildrentobuildtheK’NEXSplittingWedge
model (Pages 12-13 of the Building Instructions).
 • Askthemtoplanhowtheywillmakethetwo
components of the K’NEX model when given only
10 minutes to complete the task.
 • Tohelpthechildren’sobservations,askthemtomark
the two halves of their K’NEX ‘log’ and the tip of their
wedge with dot stickers or adhesive tape.
Education
®
38


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