#### Question

Fig 3.18 below shows the use of a lever.

(a) State the principle of moments as applied to the above lever.

(b) Give an example of this class of lever.

(c) If FA = 10 cm, AB = 500 cm calculate: (i) the mechanical advantage and (ii) the minimum effort required to lift the load.

#### Solution

(a) The principle of moments: Moment of the load about the fulcrum=moment of the effort about the fulcrum

FB × Load = FA × Effort

(b) Sugar tongs the example of this class of lever.

(c) Given: FA = 10 cm, AB = 500 cm, BF = 500 + 10 = 510 cm.

The mechanical advantage

M.A = `"AF"/"BF"`= `10/510`= `1/51`

The minimum effort required to lift the load

Effort = `"Load "/"M.A"`=`50/(1/51)` = 2550 N

Is there an error in this question or solution?

Solution Fig 3.18 Below Shows the Use of a Lever. (A) State the Principle of Moments as Applied to the Above Lever. (B) Give an Example of this Class of Lever. If Fa = 10 Cm, Ab = 500 Cm Calculate: Concept: Concept of Lever.