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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Manual

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Whole class
•Reviewhow,inpreviouslessons,thechildren
investigated the type of lever used in a seesaw and a
balance. Explain that in this lesson they will investigate
a different type of lever and discover how it operates
in a wheelbarrow. Children may be familiar with a
wheelbarrow but they may not recognise it as a lever
in action.
Working in Groups of 2-3
•AskeachgrouptobuildtheirK’NEXwheelbarrowmodel
and investigate how it works.
•Thechildrenshouldlinethetrayoftheirwheelbarrow
with aluminium foil or cling film. This will prevent the
washers, or other small objects, from falling out as they
are moved in the wheelbarrow.
•Questionstoask:
•Whatarewheelbarrowsusedfor?
•Whattypesofloadsarenormallycarried
in wheelbarrows?
•Howarewheelbarrowsloadedandunloaded?
  •Howgoodisthewheelbarrowdesignforits
intended purpose?
  •Howgoodisthewheelbarrowforliftingandmoving
heavy loads? (If they did not have a wheelbarrow
how might they lift and move a heavy load?).
 • Thechildrenshouldbeencouragedtorecord,describe
and explain their observations, using labelled drawings
where possible.
 • Askthechildrentoinvestigatethewheelbarrowasa
lever and to identify and label the positions of the
fulcrum, load and effort on their model using the dot
stickers or masking tape labels.
 • Whatarethedesignfeaturesthatmakeawheelbarrow
a good machine for lifting and moving heavy loads?
 • Reviewwiththechildrenhowtheydiscoveredinthe
seesaw and balance investigations that a large
weight/force close to the fulcrum could be moved by
a smaller weight/force further away from the fulcrum.
 • Howdothepositionsoftheeffort,fulcrumandload
compare to those they found in their K’NEX balance
and seesaw models?
Teacher’s Notes
To promote the wider use and
application of ICT skills and practices,
the children’s models and work might
be recorded using a digital camera.
Wheelbarrows are normally used to
carry loose materials such as sand, soil
or rubble. The wheel not only reduces
friction and makes it easier to move
over surfaces, but it also acts as a
pivot to tip up the wheelbarrow to
empty it. The tray has a sloping front
end to make it easier to tip out the
loose materials.
The handles used for lifting the load
are placed much further from the
fulcrum than is the load being carried.
Force meters could be introduced
to enable the children to compare
the force needed to vertically lift the
wheelbarrow with its load, versus the
force needed to lift the load using
the handles.
In wheelbarrows the load is
positioned between the lifting effort
force and the fulcrum. This means that
the lifting force will always be amplified.
The load and the effort also move in
the same direction.
Lesson 4: The Wheelbarrow
levers and pulleys
website: www.knexeducation.co.uk
Education
®
… 28 …


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