. 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?
Best Answer
(a) There are 4 strands of tackle supporting the load.
(b)
(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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