LEVER

Elements and types of a lever

The elements of a lever are:

a) Point support (O).
b) Resistance (Q) = Force that wants to beat.
c) Power (F) = force applied.
d) resistance arm (bq) = distance from the fulcrum to the line of action of the resistance.
e) Power Arm (bF) = distance from the fulcrum to the line of action of the power.

Types lever

We consider three classes of levers according to the position of "power" and "resistance" regarding the "fulcrum", they are:

1) First type of lever:
A lever is of first type when the fulcrum is located between the resistance and power.
While the fulcrum closer to the load is then applied force may be less. It is our intuitive idea lever, which helps us to move a heavy load
Examples, a vise or pliers, a seesaw game

2) Second type of lever:
A second type is lever when the resistance is between the fulcrum and the power, the load is located in the part nearest the fulcrum and the force applied in the distant
As the levers of the second kind, the power arm is always greater than the resistance arm, all of them are gaining strength.
Examples:
A mason who leads his barrow, when applying to a bottle opener soda

3) Third type of lever:

A lever is of the third type when the power is between the fulcrum and resistance.
In this type of lever, the power arm is always less than the resistance arm and, therefore, power is greater than the resistance. So always lost strength, but you gain comfort and strength has great movement.
Examples:
A fisherman holding the rod.