Question

What is the relationship between the mechanical advantage and the velocity ratio for the practical machine?

Answer 1

The efficiency in terms of mechanical advantage and velocity ratio is,

$Efficiency=\frac{Workdone\left(output\right)}{Workdone\left(input\right)}\times 100\%=\frac{Mechanicaladvantage}{Velocityratio}\times 100\%$

1. In the case of a practical machine, the output work is always less than the input work, because part of the input energy is wasted against friction and other factors.
2. From the formula, the mechanical advantage is less than the velocity ratio.
3. Thus, for a practical machine, $\mathrm{MA}<\mathrm{VR}$.