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wheels and axles and inclined planes
website: www.knexeducation.co.uk
Lesson 3: The Paddle-boat
Lesson�3:�The�Paddle-boat
Time: 1 hour
Learning Objectives - Children should learn:
•toinvestigateanddisassembleproductsinordertolearn
how they work
•howtoconvertrotarymotionintolinearmotion
•tocommunicateinformationaboutproductsand
mechanisms through labelled drawings
Vocabulary
wheel, axle, turn, rotate,
winding, mechanism, faster, slower,
compare, friction, resistance,
larger, smaller, design
Possible Teaching and Learning Activities
Whole class
•Reviewtheoutcomesofthepreviouslessoninwhichit
was found that a wheel and axle mechanism can be
used in two ways.
1. A large wheel turns an axle, as in a water wheel
or the winding mechanism of a well.
2. A small axle turns a large wheel, as in a car.
•Explainthatinthislessonthechildrenwillinvestigate
how paddle-boats use an axle turning a large wheel to
drive them through the water.
•Childrenmaybefamiliarwithsteampaddle-boatsfrom
films, or perhaps their own experiences of seeing or
using pedal powered boats – pedalos - while on
holiday. The method of propulsion is the same: the
paddles push against the water, driving the boat
forward.
•Swimmingusesthesameprinciple-thechildrenpush
against the water using their arms and feet. Flippers
allow them to swim faster but it is harder to push
against the water.
Resources
Each group of 2-3 children
will need:
1 K’NEX Understanding
Mechanisms: Wheels and Axles
and Inclined Planes kit with
Building Instructions booklet
Heavy-duty elastic bands
Small blocks of wood or expanded
polystyrene foam to help the model
float (2 per model)
Sheet plastic/card
Cling film or aluminium foil
Scissors
Ruler and pencil
Adhesive tape
Container or sink filled with water to
test paddle-boats
Useful Internet Web Sites:
www.ulster.net/hrmm/steamboats/
fulton.html: Reviews the historical
development of steamboats from
the early 19th Century.
www.museum.state.il.us:
Go to: ‘Search this web site.’ Enter:
“steamboats and paddle boats” and
follow simple links. A useful source of
historical photographs.
www.pics.tech4learning.com:
Go to: ‘Transportation/boats’ for free
photographs of paddles in action.
Education
®
18


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