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Multiple Movable Pulley

The diagram a...

Question

The diagram alongside shows an arrangement of three pulleys A, B and C. The load is marked as L and the effort as E.

(a) Name the pulleys A, B and C.

(b) Mark in the diagram the directions of load (L) effort (E) and tension $T_{1}$ and $T_{2}$ in the two strings.

(c) How are the magnitudes of L and E related to the tension $T_{1}$ ?

(d) Calculate the mechanical advantage and velocity ratio of the arrangement.

(e) What assumptions have you made in parts (c) and (d)?

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Solution

(a)Pulley A and B are movable pulleys, C is fixed
(b)

(c)The magnitude of effort, E = $T_{1}$
The magnitude of the load, L=
(d MA=
Velocity ratio=
(e)Assumptions: Pulleys A and B are weightless

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