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Diagram shows a weightless lever in equilibrium.  Neglect friction at the fulcrum.

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

(ii)  Give the expression for mechanical advantage.

(iii) Name the type of lever which has M.A greater than 1.

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert

(i)  Clockwise moment of the load about the fulcrum = Anticlockwise moment of the effort about the fulcrum.

or L X BF = E X AF.


(iii) Class II of lever Eg. nutcracker, wheel barrow or Class I of lever only when Effort arm > Load arm.

Answered by Expert 4th June 2014, 3:23 PM
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