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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. |
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Answer» (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 |
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