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Working in Groups of 2-3
 • AskthechildrentobuildtheK’NEXFlagpolemodel,
(Pages 10-11 of the Building Instructions booklet), and
allow them time to investigate how it works and what
it does.
 • Withthehelpofalabelleddiagramdrawnontheboard,
discuss how a pulley wheel works and how the rope fits
into the groove in the rim of the wheel.
Whole Class
 • ExplainhowtheirK’NEXFlagpolemodelprovidesan
example of a FIXED pulley. This is a pulley that does not
move when the rope is pulled, although the wheel may
spin in place.
 • Askthechildrenwhytheythinkflagpolesmakeuseof
pulleys to raise and lower a flag.
 • Howwouldtheygetaflagtothetopofthepoleifthey
did not use a pulley?
 • Wherehavethechildrenseenotherexamplesofthis
type of pulley being used?
Teacher’s Notes
The children should not cut the
string in this model. A long string
will be needed for subsequent pulley
building activities.
See: A Quick Guide to Pulleys and
Key Technical Terms and Scientific
Definitions for additional information.
It is easier and safer to pull down on a
rope to raise a flag than it is to climb a
tall ladder to secure the flag to the top
of the pole.
Possibly on cranes, washing lines,
on equipment in the school gym,
or classrooms.
Free photographs of pulleys in
action on cranes can be obtained from
www.freefoto.com
How many different types of machines do the children know
about that use pulleys in their mechanisms?
What do these machines do?
A pulley is a wheel with a groove
around its outside edge into which a
rope or belt can fit. By pulling down
on one end of the rope a load on the
other end can be lifted. Pulleys can
be used to change the direction of
movement and can make it easier to
lift heavy objects. Children will be
able to explore different types of pulley
systems during the next few lessons.
For additional information please
refer to A Quick Guide to Pulleys and
Key Technical Terms and Scientific
Definitions.
Internet Web site on pulleys:
www.howstuffworks.com and
search ‘pulleys’.
Lesson�7:�The�Flagpole
Education
®
45


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