TERMS:

FULCRUM - A pivot about which a lever rotates. Usually represented by a triangle.

Resistance = R

Effort = E

Length Resistance has to travel, usually in a plane = L

Height Resistance ends up traveling, usually in a plane = H

Distance from fulcrum to the Resistance = D _R

Distance from fulcrum to the Effort = D _E

Work Input = W _I

Work Output = W _O

Height Resistance travels = H _R

Height Effort travels = H _E

Actual Mechanical Advantage = AMA

Ideal Mechanical Advantage = IMA ( When there is no friction )

To balance a First Class Lever

R x D _R = E x D _E

W _I = W _O ( When there is no friction )

W _I = E x D _E

W _O = R x D _R

EFF = EFFICIENCY

EFFICIENCY = W _O   /    W _I      x     100

Back to home page => Vera and Science