The adjacent diagram shows a block and tackle system of 4 pulleys.
(i) Four strands of tackle support the load.
(ii) The tension in each strand is shown by the arrow marked as T.
(iii) If we neglect the friction of the pulleys and weight of the pulleys in the lower block, then:
L = 4T
And E = T
∴ M.A. = L/E
(iv) If load is pulled up by a distance 1m, the effort end moves by 4 m.