Why is M.A always less than V.R
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42
The mechanical advantage(M.A) of a real machine is always less than its velocity ratio(V.R) because mechanical advantage decreases due to the friction and weight of moving parts of the machine whereas the velocity ratio remains constant.
However If mechanical advantage had been equal to the velocity ratio of the machine, the efficiency would have been 100%, which is impossible in reality.
But in an Ideal machine, Mechanical Advantage and Velocity ratio would always be equal to each other. Because of friction, air resistance, this Ideal situation would never be achieved.
Thus ratio between mechanical advantage and velocity ratio is always less than 1, which again implies that M.A. should always be less than V.R .
However If mechanical advantage had been equal to the velocity ratio of the machine, the efficiency would have been 100%, which is impossible in reality.
But in an Ideal machine, Mechanical Advantage and Velocity ratio would always be equal to each other. Because of friction, air resistance, this Ideal situation would never be achieved.
Thus ratio between mechanical advantage and velocity ratio is always less than 1, which again implies that M.A. should always be less than V.R .
Answered by
33
because mechanical advantages decrease due to the friction and weight of moving parts of the machine
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