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A�Quick�Guide�to�Levers
Useful Web Sites.
http://www.enchantedlearning.com/physics/
machines/Levers.shtml This web site has
some very simple animated drawings of the
different types of levers in action.
http://www.coe.uh.edu/archive
The University of Houston archive of lessons.
Go to: Collection > Science > Lesson plans >
Simple Machines.
www.flying-pig.co.uk A general site for simple
machines offering useful animated drawings of
mechanisms in action.
www.howstuffworks.com A library of
information on different types of machines.
Useful background information for teachers –
you will need to use the search facility to find
information.
www.mos.org/sln/Leonardo/
InventorsToolbox.html A useful site covering
general information on levers and other
simple machines.
www.smartown.com/sp2000/machines2000/
Simple machines made simpler. A good
introduction to simple machines made by
school children.
The main boom is a
3rd class lever.
The excavating arm is
a 1st class lever.
Fulcrum
Load
Effort
The excavating arm is
hinged onto the main boom
and is pulled and pushed
by the hydraulic cylinder
attached to the main boom.
The arm and bucket
operating mechanism are
examples of 1st class
levers in action.
Fulcrum
Load
Effort
The main boom and
excavator arm together
make up a 3rd class lever.
The effort force is the push
and pull provided by the
hydraulic cylinder between
the digger chassis and the
moving arm.
JCB excavators that use a series of hydraulically operated arms are good examples of multiple
levers in action.
Education
®
11


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