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

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 • 3rdClassleversarenotasefficientas
other levers because the load is always
further from the fulcrum than the effort.
A Quick Guide to Levers
Compound 3rd Class levers
A small movement of the fingers squeezing the
two arms together produces a long movement
at the tips of the tweezers in order to grip an
object such as a hair. The load is the resistance
of the hair.
For example, raising a fish with a fishing
rod actually requires more effort force
than just lifting the fish using only a hand-
held line. A fishing rod, however, helps by
lifting the fish quickly. A small movement
of your hands near the fulcrum produces
a large movement at the tip of the rod, but
both move in the same period of time. As
a result, the tip of the rod (and the fish
attached to it) actually moves more quickly
than the hands and this quick action can
help land the fish before it escapes.
Some machines use more than one type of
lever in their working mechanisms.
Nail clippers involve a double action - the
handle presses down onto the tweezer-like
action of the cutters. The handle is a 2nd Class
lever while the cutter is a 3rd Class lever.
The head of the claw hammer is a 3rd Class
lever while the claw is a 1st class lever.
Education
®
levers and pulleys
website: www.knexeducation.co.uk
… 10 …


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