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Question
What is the mechanical advantage of a single movable pulley in the ideal case?
Solution
It consists of a movable pulley A and a fixed pulley B and string passes over as shown. Load is suspended from movable pulley A and effort is applied at free and as shown.
Tension T supports pulley A on both sides and pulls it up half the distance.
The effort balances Load L.
L = T + T = 2T
E = T
M.A. = `"Load L"/"Effort E" = (2T)/T = 2`
M.A. in ideal case = 2
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