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(i) What is mechanical advantage? (i...

(i) What is mechanical advantage?
(ii) Define efficiency of a machine.

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Define mechanical advantage.

(i) With reference to the terms, mechanical advantage, velocity ratio and efficiency of a machine, name the term that will not change for a machine of a given design. (ii) Define the term stated by you in part (i).

In a wheel and axle machine the radii of the wheel and axle are 0.5 m and 0.05 m,respectively . A weight of 100 kg is raised when it is hanging by a rope from the axle by applying a force of 12 kg on the circumference of the wheel . Find the mechanical advantage, velocity ratio and efficiency of this machine.

Define mechanical advantage of a lever.