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•Askthemwhyitmightbeeasierforhimtocarryloads
in this way. What would happen if the man’s load were
not balanced on each side of the pole?
Working in Groups of 2-3
•Explainhowtheclasswilldiscoverhowabalance
works by building and investigating a K’NEX
model balance.
•AskeachgrouptobuildtheK’NEXBalancemodel
shown on Pages 4-5 of the Building Instructions
booklet. Allow them time to investigate how their
model works.
Whole Class
•TalkaboutthesimilaritiesbetweentheK’NEXBalance
model and the Seesaw model, investigated in a
previous lesson.
•Discusshowthebalanceisanexampleofalever.
•Askthechildrentopreparestickylabelsandusethem
to identify the different parts of their balance model.
F = Fulcrum L = Load E = Effort Beam
•(Optional)Explainhowthebalanceandseesaware
examples of a 1st Class lever and that there are 3
different types of levers: 1st Class, 2nd Class and 3rd
Class levers. Tell the children that they will be able to
investigate the different lever types in other lessons.
Working in Groups 2-3
 • Askthechildrentoremovethegreyhangingtrays(grey
pulley wheels) from their model and push the red and
orange hangers to the end of the balance arms.
 • Oncethetwoarmsarestationary,askthechildrento
observe and describe what the model is doing, using
the correct vocabulary.
 • Whathappenswhenoneendofthebalancearmis
given a small push/has a force applied?
 • Thechildrenshouldbeaskedtoexplaintheir
observations.
 • Discusshowthisactivitydemonstratesthatanobject
will remain stationary until a force acts on it.
Teacher’s Notes
The balance model does not move
because the forces acting on both arms
are balanced. When a force
is applied to one side it will move
because the forces are now
unbalanced. The arm to which the
force has been applied moves in the
direction of the applied force. If a
weight is used, instead of a push, it
will also causes the arm to move.
Weight is also a force.
The balance will remain stationary, or
at rest, until a weight is loaded on one
side or a force is applied to one side.
If that weight or force is larger than the
weight or force on the opposite side
then the forces acting on the balance
arm will become unbalanced and the
Teacher’s Notes
If the load is not balanced evenly, one
side will hang down lower than the
other and make it difficult to carry.
Lesson 3: The Balance
levers and pulleys
website: www.knexeducation.co.uk
Education
®
22


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