Why does increasing the length of an inclined plane reduce effort?
AIt reduces the weight of the body
BIt reduces friction
CIt increases the velocity ratio
DIt changes the angle to 90 degrees
Answer & Solution
Correct answer: C. It increases the velocity ratio
1. V.R. of an inclined plane = length / height.
2. Increasing the length while keeping the height constant raises V.R.
3. M.A. = V.R. * efficiency, so M.A. also rises.
4. With higher M.A., the same load needs less effort.
5. So a longer inclined plane reduces effort.
_Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_
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