What is the relationship between the mechanical advantage and velocity ratio of (i) An ideal machine and (ii) Practical machine ?
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Answered by
69
All practical machines have friction and hence the output energy ia always less than the input energy.
Therfore the efficiency of all practical machines is always less than 1.
By some good manufacturing technology and using high quality and suitable lubricants we can make the efficiency nearly equal to 1.
The ideal machine has an efficiency 1.
Efficiency = Mehanical Advantage / velocity Ratio.
For ideal machine efficiency = 1.
Hence M.A = V. R.
The V. R of an ideal machine and the practical machine is a constant or is the same for both.
For practical machine M. A will be less than V.R.
Hence we can say that the maximum M. A is the V.R.
For example, the V . R of a pulley is 1.
M.A will be less than 1, due to friction.
Therfore the efficiency of all practical machines is always less than 1.
By some good manufacturing technology and using high quality and suitable lubricants we can make the efficiency nearly equal to 1.
The ideal machine has an efficiency 1.
Efficiency = Mehanical Advantage / velocity Ratio.
For ideal machine efficiency = 1.
Hence M.A = V. R.
The V. R of an ideal machine and the practical machine is a constant or is the same for both.
For practical machine M. A will be less than V.R.
Hence we can say that the maximum M. A is the V.R.
For example, the V . R of a pulley is 1.
M.A will be less than 1, due to friction.
Answered by
84
V.R=M.A-ideal machine
V.R>M.A- practical machine
V.R>M.A- practical machine
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