A crow bar of length 100 cm is used to lift a load of 5 kgf.

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asked 6 days ago in Class X Science by navnit40 (-1,119 points)

A crow bar of length 100 cm is used to lift a load of 5 kgf. It has its fulcrum at a distance of 20 cm from the load. Calculate: (i) the mechanical advantage of crow bar, and ii) the effort applied at the other end.

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answered 6 days ago by priya12 (-10,126 points)

Given: L = 5 kgf, Load arm = 20 cm, Effort arm = 100 – 20 = 80 cm.
(Since the crow bar is the lever of first order with fulcrum in between the load and the effort).

(i) Mechanical advantage = Effort arm/Load arm = 80/20 = 4

(ii) M.A. = Load(L)/Effort(E)

  Effort  = Load(L)/M.A.  = 5/4

= 1.25 kgf.

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