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Lesson�3:�The�Paddle-boat
Teacher’s Notes
This activity involves children
stretching an elastic band. There is a
need to carry out a risk assessment for
the activity. See: Safety Information at
the beginning of this Guide. Children
should be warned about the dangers
of overstretching an elastic band when
investigating their model.
Working in Groups of 2-3
 • AskeachgrouptobuildtheirK’NEXPaddle-boatmodel
and allow them some time to investigate how it works.
 • Explainthattheyshouldwindtheelasticbandaround
the axle using the grey end Connector and then release
it to observe how the paddle mechanism works. You
might suggest they think about the following:
   •Whatisthefunctionofthemachine?
   •Whatarethefunctionsofthemovingparts?
   •Howarethemovingpartsmadetomove?
   •Identifyandnamethewheelandaxle.
   •Howquicklydoesthewheelmovewhenreleased?
Whole Class
Using the K’NEX Paddle-boat as an example, demonstrate on
the board how to make simple labelled drawings. Include the
use of arrows to show the direction of movement.
Working in Groups of 2 - 3
 • Askthechildrentorecordtheirobservationsandresults,
using labelled drawings and notes. Arrows should be
included to show the direction of movement. The children
should be encouraged to use the correct vocabulary and
terminology as they describe how the mechanism works.
Whole Class
 • Talkaboutthechildren’sobservations.Encourage
them to use their K’NEX models to demonstrate their
explanations using the correct technical vocabulary.
* What provided the force to turn the wheel and axle?
See: A Quick Guide to Wheels
and Axles for additional information.
Children’s models and work could
be recorded using a digital camera
so enabling the wider use of ICT skills
and practices.
* The energy stored in the
stretched elastic band.
Discuss the difference between the
speed at which the wheels move when
the elastic band is being wound up
compared to when it is released.
The children should notice that it takes
a lot of effort to wind the elastic band
using the axle and the paddle-wheels
rotate slowly. Once released, however,
the paddle-wheels spin very quickly.
The elastic band serves as a “motor”
that provides the turning forces (effort)
to turn the axle and hence the wheel.
Education
®
19


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