Download Mechanical Advantage

 When
a machine takes a small input force
and increases the strength of the output
force, a mechanical advantage has been
produced.
 Mechanical advantage is the ratio of
output force divided by input force. If the
output force is bigger than the input force,
a machine has a mechanical advantage
greater than one
 …meaning it made work easier for you
MA=output
MA=Length
force/input force
of input
arm/length of output arm
A
construction worker uses a board and log as
a lever to lift a heavy rock. If the input arm
is 3 meters long and the output arm is 0.75
meters long, what is the mechanical
advantage of the lever?
4
A
child’s toy rake is held so that its output
arm is 0.75 meters. If the mechanical
advantage is 0.33, what is the input arm
length?