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Class 2 Lever

In fig below ...

Question

In fig below shows a lever in use.

(a) To which class of lever does it belong?

(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.

(c) Calculate the value of E.

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Solution

(a) Class 2 lever
(b)If FA = 80 cm, AB = 20 cm,

BF=FA+AB=80+20=100cm

$M A equals fraction numerator B F over denominator A F end fraction equals 100 over 80 equals 1.25$
(c) Effort = $\frac{L o a d}{M A} = \frac{5}{1.25} = 4 k g f$

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