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Lesson�4:�The�Wheelbarrow�
2nd Class Lever
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
lever, pivot, fulcrum, beam,
handles, effort, load, lift, weight,
force, Newton, heavy, object,
force meter, design specification,
compare, modify, 1st Class lever,
2nd Class lever, labelled drawings
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
Aluminium foil or cling film
A pile of small washers, paper
clips or plastic beads or other
small objects that are awkward to
carry by hand
Force meters
Useful Internet Web Sites:
Please refer to Page 10 of A Quick
Guide to Levers.
Possible Teaching and Learning Activities
Intoduction
In this lesson children investigate the science used in the
design of a wheelbarrow and how knowledge and under-
standing of the lever principle can help them modify and
improve its design for a different purpose.
Whole class
•Explainthatalthoughleverscomeindifferentforms,
they all use the same basic principle: if a heavy object
(load) is positioned close to the fulcrum, less force
(effort) is needed to move it.
For example, a door, a paper guillotine, a stapler and
nutcrackers all make use of the lever principle but they
all have very different functions.
•Askthechildrenifitiseasiertoopenadoorbypushing
close to the hinge or at the handle? Explain that the
door hinge is the fulcrum, the weight of the door is the
load and the effort is applied where you push. Review
their findings from previous lessons – if the effort is
applied a long way from the fulcrum work will be easier.
Teacher’s Notes
If time is available, or as prior
learning in an ICT lesson, children
could use the Internet to research
different uses of levers.
Education
®
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