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# A Boy Has to Lift a Load of Mass 50 Kg to a Height of 1 M. (A) What Effort is Required If He Lifts It Directly? Take G = 10 N Kg-1 (B) If the Boy Can Exert a Maximum Effort of 250 N, So He Uses an I - ICSE Class 10 - Physics

ConceptConcept of Machines Numercials

#### Question

A boy has to lift a load of mass 50 kg to a height of 1 m. (a) what effort is required if he lifts it directly? Take g = 10 N kg-1 (b) If the boy can exert a maximum effort of 250 N, so he uses an inclined plane to lift the load up. What should be the minimum length of the plank used by him?

#### Solution

Mass of load m = 50 kg
Force required to lift a load 1 meter (h) = mxg = 50x10 = 500N
The maximum effort exerted by boy E =250 N
Mechanical advantage M.A = "𝑙𝑜𝑎𝑑"/"𝑒𝑓𝑓𝑜𝑟𝑡" =  500/250 = 2
M.A = "𝐼"/"ℎ"