. Figure shows a block and tackle system of pulleys used to lift a load. (a) How many strands of tackle are supporting the load


Figure shows a block and tackle system of pulleys used to lift a load.

(a) How many strands of tackle are supporting the load?
(b) Draw arrows to represent tension T in each strand.
(c) What is the mechanical advantage of the system?
(d) When load is pulled up by a distance 1 m, how far does the effort end move?
(e) How much effort is needed to lift a load of 100 N?

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Best Answer

(a) There are 4 strands of tackle supporting the load.

(b)

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(c) The mechanical advantage of the system

M.A. = Load / Effort

= 4T / T

= 4

(d) When load is pulled up by a distance 1 m, the effort end will move by a distance

= 1 × 4 = 4m

(e) M.A = Load / Effort

4 = 100 / effort

Effort = 100 / 4

= 25 N

 

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