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Lesson�6:�Scissors
Teacher’s Notes
Use a magnifying glass to show
children the shape of the cutting
edge. The role of the levers is to
amplify the squeezing forces from
your hand.
See K’NEX Introducing
Mechanisms: Wheels and Axles and
Inclined Planes Teacher’s Guide for
further work on wedges.
The blades cut with great force
into the paper and, just like all
wedges, move the cut paper edges
apart in a sideways direction. This
action is similar to an axe splitting
wood or a knife cutting an apple
into two pieces.
If possible demonstrate how
this technology works using the
K’NEX wedge model from K’NEX
Introducing Mechanisms: Wheels
and Axles and Inclined Planes kit.
* At the handles.
* The resistance of the paper or
card to the cutting blades.
Some children may observe that
they need to use two effort and
load labels on their model but
only one for the fulcrum. A pair of
scissors makes use of two levers
working in opposite directions and
is an example of compound or
connected 1st Class levers.
The hinge (fulcrum) is common
to both levers and is positioned
between the effort (handles) and
the blades (load).
Working in Groups of 2-3
Investigating how scissors work
•AllowthechildrentimetomaketheirK’NEXscissors
model and to investigate its action.
* Ask them what scientific concept is being used
when scissors work. You may need to provide
them with a clue. Scissors have a hinge or fulcrum
about which each blade rotates.
* Where is the effort applied?
* What acts as the load?
•Usedotstickersormaskingtapetolabelthepartsof
the scissors:
F = Fulcrum L = Load E = Effort
Use arrows to show the direction of the applied forces.
Cutting edges of scissors.
The sideways movement of a wedge.
Education
®
37


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