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Lesson 7: The Flagpole
Lesson�7:�The�Flagpole
A Fixed Pulley System
Time: 1 - 1.5 hours
LearningObjectives - Children should learn:
•pulleysarewheelswithgroovesaroundtheirouterrim
•pulleyscanbeusedtoliftobjectsandchangethe
direction of movement
•torelatesciencetothewaysinwhichfamiliar
machines work
•tocarryoutasimpleinvestigation
Vocabulary
pulley, wheel, groove, rim, fixed, pull,
force, lift, raise, lower, gravity, rotary,
motion, linear, load, effort, Newtons,
measurement, opposite, direction
Resources
Each group of 2-3 children
will need:
1 K’NEX Understanding
Mechanisms: Levers and Pulleys kit
with Building Instructions booklet
Dot stickers or pieces of masking
tape
Felt-tipped pens
Measuring tape or rulers
Coloured paper or cloth
Coloured crayons or pencils
Scissors
Stapler, glue or tape
200g slotted weights
1 small bucket or basket filled with
heavy objects
String/rope
Broom handle
Possible Teaching and Learning Activities
Introduction
The activities in this lesson may be used to support the
QCA/DfEE Exemplar Scheme of Work for:
Design and Technology Unit
•2C:WindingUp
Science Units
•1E:PushesandPulls
•2C:ForcesandMovement
•6E:BalancedandUnbalancedForces
Whole Class/Demonstration:
 • Reviewwiththechildrenhowmanyofthesimple
machines they have investigated make it easier to lift
heavy objects.
 • Askforavolunteer(s)tobend,facedown,overa 
table/desk, next to one edge, and reach down on the
side of the table/desk to lift a bucket or basket filled
with heavy objects. (Children should not extend an arm
over the front of the desk).
 • Askthevolunteertodescribehowdifficult(oreasy)
this was for them.
 • Securearopetothebucketandaskthemtopullitup
using the rope.
 • Encouragethechildrentoconsiderwaysinwhichthis
could be done more easily. For example: place a broom
handle across two desks and loop the rope over the
handle. The volunteer can now pull down on the rope
instead of pulling up. Does this arrangement make it
easier or more difficult to lift the load? Record their
suggestions/answers on the board for later reference
and discussion.
 • Explainthattheirtaskistobuildamodelthatwill
demonstrate the use of a simple machine called a
pulley that can make the job of raising an object easier.
levers and pulleys
website: www.knexeducation.co.uk
Education
®
44


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