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The diagram alongside shows and arrangement of three pulleys A, B and C. The load is marked as L and the effort as E.
The diagram alongside shows and arrangement of three pulleys A, B and C. The load is marked as L and the effort as E.
Class 10 | ICSE | Machines | Physics | Selina
The diagram alongside shows and 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 direction of load (L), effort (E) and tension T1 and T2 in the two strings.

(c) How are the magnitudes of L and E related to the tension T1?

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

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

Solutions :

(a) Pulleys A and B are movable pulleys and the pulley C is a fixed pulley.

(b)

(c) The magnitude of effort E is T1

The magnitude of L is 22 T1 = 4T1

(d) The mechanical advantage is 22 = 4

The velocity ratio = 22 = 4

(e) The pulleys A and B are weightless and there is no friction

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