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in Class X Science by (-2,152 points)

Draw the diagram of a single movable pulley and obtain its mechanical advantage, velocity ratio and efficiency.

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Since it is inconvenient to apply the effort in an upward direction, a single fixed pulley is used to change the direction of effort.

In equilibrium, L = T + T = 2T

E = T

Mechanical advantage = Load(L)/Effort(E) = 2T/T = 2

As the effort is pulled down through a distance dE, the two segments of the thread carrying the movable pulley and the load goes up by dE/2.

Hence, dL = dE/2

Velocity ratio (VR) = dE/dL

= dE/dE/2

= 2.

Efficiency = MA/VR

= 2/2

= 1 or 100%.

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