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A Quick Guide to Levers
The Principle of Levers identifies a relationship between the effort, the load and the distance of
each from the fulcrum. This principle states that a lever is balanced (or in a state of equilibrium) when:
Key facts
In a 2nd Class lever:
• The load is between the effort and
the fulcrum.
• The effort and load move in the
same direction.
the effort x its distance from the fulcrum
on one side
the load x its distance from the fulcrum
on the opposite side
=
A pair of scissors is an example of two 1st
Class levers working together. Squeezing the
handles together produces the effort, the hinge
is the fulcrum and the resistance of the card
being cut is the load. The strongest cutting
action is nearest the hinge.
Wire cutters have longer arms than scissors.
This design modification generates a much
more powerful cutting action by increasing the
length of the effort arm.
Fig. 4
2nd Class Levers
Education
®
levers and pulleys
website: www.knexeducation.co.uk
8


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