Physics
(a) What is meant by an ideal machine?
(b) Write a relationship between the mechanical advantage (MA) and velocity ratio (VR) of an ideal machine.
Answer
(a) An ideal machine is that where there is no loss of energy i.e. the work output is equal to the work input. An ideal machine is 100% efficient.
(b) For an ideal machine (free from friction etc.), work output is equal to the work input, so the efficiency is equal to 1 ( or 100% ) and the mechanical advantage is numerically equal to the velocity ratio. So,
For an ideal machine, M.A. = V.R.
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