2: The mechanical
advantage (MA) is
the factor by which a machine multiplies the force put into it.
3: The effort arm represents where force is input. The effort arm is always larger
than the resistance arm.
do we Calculate Mechanical Advantage of a Lever-
MA = length of effort arm ÷ length of resistance arm.
remaining writings regarding levers date from the 3rd century BC and were provided
by Archimedes. Give me the place to stand, and I shall move the earth is
a remark of Archimedes who formally stated the correct mathematical principle
of levers (quoted by Pappus of Alexandria).
ancient Egypt, constructors used the lever to move and uplift obelisks weighting
more than 100 tons.
force applied (at end points of the lever) is proportional to the ratio of the
length of the lever arm measured between the fulcrum and application point of
the force applied at each end of the lever. Mathematically, this is expressed
by M = Fd.
are the three classes of levers
are three classes of levers representing variations in the location of the fulcrum
and the input and output forces.
- Seesaw (also known as a
- Pliers (double lever)
- Scissors (double
handle of a pair of nail clippers
- Human arm
(double lever) (where hinged at one end, the style with a central pivot is first-class)
number of tools, such as a hoe or scythe
main body of a pair of nail clippers, in which the handle exerts the incoming