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Lesson�3:�The�Balance�
1st Class Lever
Time for each lesson: 1 - 1.5
hours
LearningObjectives - Children should learn:
•toobserveanddescribemovements,directionandtypes
of forces working in a lever mechanism
•torelatesciencetothewaysinwhichfamiliar
machines work
•tocarryoutasimpleinvestigation
Vocabulary
balance, unbalanced, lever, pivot,
fulcrum, beam, load, effort, direction,
movement, up, down, weight, mass,
level, force, Newton, friction, opposes,
motion, gravity, horizontal, stationary
Resources
Each group of 2-3 children
will need:
1 K’NEX Understanding
Mechanisms: Levers and Pulleys kit
and Building Instructions booklet
Dot stickers or pieces of masking
tape
Felt-tipped pens
Washers, paperclips (all of an equal
size) or slotted gram masses to
hang from the balance arms
Ruler
Useful Internet Web Sites:
Please refer to Page 10 of A Quick
Guide to Levers.
Possible Teaching and Learning Activities
Introduction
The activities outlined in this lesson may be used to support
the QCA/ DfEE Exemplar Scheme of Work for:
Design and Technology Unit
•1A:Playgrounds
•1D:MovingPictures
•3C:MovingMonsters
•4B:Storybooks
•5C:MovingToys
•6C:Fairground
Science Units
•1E:PushesandPulls
•2C:ForcesandMovement
•6E:BalancedandUnbalancedForces
Whole Class
•Talkabouthowbalancesandotherweighingdevices
with which the children may be familiar from other
lessons, (for example: mathematics), have been used
for centuries. Help the children to understand that
distributing weight equally, using a form of balance,
can also make it easier to carry heavy loads. Ask the
children to look at the man in the photograph on Page
4 of the K’NEX Building Instructions booklet.
Teacher’s Notes
The large load is split into two equal
portions and evenly balanced across
his shoulders.
Education
®
21


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