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wheels and axles and inclined planes
website: www.knexeducation.co.uk
Lesson 6: The Splitting Wedge
Lesson�6:�The�Splitting�Wedge
Time: 1.5 hours
Learning Objectives - Children should learn:
•toinvestigateanddisassembleproductsinorderto
learn how they work
•aboutsimplemachinesthatmakeiteasiertodothings
•torelatesciencetothewaysfamiliarmachineswork
•tocommunicateinformationaboutproductsand
mechanisms through labelled drawings
Vocabulary
wedge, inclined plane, force, effort,
sideways, distance, force, increased,
because
Resources
Each group of 2-3 children
will need:
1 K’NEX Understanding
Mechanisms: Wheels and Axles
and Inclined Planes kit with
Building Instructions booklet
A4 Paper
Scissors
Felt-tipped pen
Adhesive tape or dot stickers
4 large books (optional)
You will need:
A collection of tools that incorporate
wedges into their design. For
example: knife, doorstop, hand axe,
chisel and scissors.
Apple/piece of cheese/piece of wood
Magnifying glass
Useful Internet Web Sites
www.coe.uh.edu/archive/
The University of Houston archive of
lessons. Search >Collections >Science
> Simple Machines >Wedge.
For Reference
Macaulay, David. ‘The Way Things
Work.’ Houghton Mifflin Company.
1988. Either the book or CD ROM is
an excellent source of information.
Possible Teaching and Learning Activities
Introduction
Whole Class
 • Reviewthepreviouslessoninwhichthechildren:
(i) discussed how less effort is needed to stroll up a
gentle slope than to climb up a steep one, and
(ii) discovered how ramps (inclined planes) make it
easier to lift a heavy load through a vertical distance
by reducing the effort needed. The load, however,
must be moved over a greater distance.
Whether the load has to be lifted vertically or pulled
or pushed up a long ramp (inclined plane) to a given
height, the job to be done in both cases is exactly the
same. The only difference is in the way it is done.
 • Explainthat,inthislesson,thechildrenwillinvestigate
how ‘inclined planes’ are found in many commonly used
tools that are used to cut or split objects.
 • Askthechildrenhoweasy,ordifficult,itmaybeto(i)
pull apart and (ii) tear apart a piece of paper using only
their hands. One or two children could be asked to try
this for themselves.
Education
®
36


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