7
SIMPLE MACHINES
A simple machine is an instrument that allows for balancing and overcoming RESISTANCE (weight, resistance force = R) with
EFFORT (manpower = E).
• Pairs of levers also obey this principle.
• Levers are classified by the relative positions of the EFFORT, RESISTANCE and FULCRUM.
FULCRUM EFFORTRESISTANCE
A lever is a simple machine that is made
up of a rigid bar which can rotate around a
fixed point called the fulcrum.
LEVERS
Since ancient times humans have
made use of many of these mech-
anisms to increase their strength
and enable them to accomplish
great feats which can still be
admired today.
Wheelbarrow
Pincers
Nutcracker
See-saw
Balance Pulley
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