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Lesson�8:�The�Sailboat��
A Compound Pulley System
Time: 1 - 1.5 hours
LearningObjectives - Children should learn:
•torelatesciencetothewaysinwhichfamiliar
machines work
•tocarryoutasimpleinvestigation
Vocabulary
pulleys, fixed, movable, force,
effort, load, double pulley sys-
tem, single pulley system, com-
pound, compare, doubled, amplify,
because, trade-off, pull, force
meter, prototype, Newton, friction,
lift, lower, raise
Possible Teaching and Learning Activities
Introduction
Whole class
•Reviewwiththechildrenhowtheuseofapulleysystem
helps make the job of raising a flag to the top of a pole
easier. In this case, the pulley is used to change the
direction of the effort force – it is easier to pull down on
a rope than to pull up on one. Using a pulley system
also means that you do not have to climb a ladder to
reach the top of the pole.
Resources
Each group of 2-3 children
will need:
1 K’NEX Introduction to Simple
Machines: 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 masses or
5 Newton force meter
Large paperclips
You will need:
The K’NEX flagpole model
Pictures of sailboats and sailing
ships available for the children
to view
Additional lengths of string for
Extension Activity 2 (optional)
Teacher’s Notes
More information on pulleys is
available from A Quick Guide to
Pulleys and the Internet web site
www.howstuffworks.com
Education
®
49


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