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The ‘golden rule of mechanics’: moment of force is
where there is a gain in force, defined as M = F ∙ l
there is a loss in distance.

unit of measurement
inclined plane SIMPLE MACHINES of moment of force in
SI: N ∙ m
textbooks nis edu kz
pulley

wedge
immovable movable

screw

centre of gravity

wheel and axle

lever

first-class lever

in equilibrium
second-class lever

B l 2 O l 1 A F 1 ∙ l 1 = F 2 ∙ l 2

F 1

F 2

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