Question

6. In Fig. 3.32, draw a tackle to lift the
load by applying the force in downward
direction.
(a) Mark in the diagram the direction of
load L and effort E.
(b) If the load is raised by 1 m, through
what distance will the effort move ?
(c) State the number of strands of tackle
supporting the load.
(d) What is the mechanical advantage of
the system ?

Answer 1

Answer:

As we know that in a system of 5 pulleys, if the load moves up through a distance 1 m, each segment of the string is loosened by a length 1m so the effort end moves through a distance 5 times 1m i.e. 5m

(c) Five strands of tackle are supporting the load.

(d) As we know,

M.A. = \dfrac{\text {Load}}{\text {Effort}} \\[0.5em]M.A.=

Effort

Load

Load = 5m

Effort = 1m

Substituting the values in the formula for M.A. we get,

M.A. = \dfrac{5}{1} \\[0.5em] \Rightarrow M.A. = 5 \\[0.5em]M.A.=

1

5

⇒M.A.=5