Question

Give the relation btwn MA and VR for:
an ideal machine
a practical machine



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Answer 1

Answer:

all practical machines have friction and hence the output energy is always less than the input energy

therefore the efficiency of all practical machines is always then 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 =mechanical advantage /velocity ratio

for ideal machinery = 1

hence M.A V.R

the v.r of an ideal machine and the practical machine i a constant or is the same of 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.

Explanation:

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