10) The block and tackle system contains 7 pulleys. So its MA is …..
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Block and Tackle Pulley system
Explanation:
Block and Tackle system
A system of two or more pulleys with a rope or cable threaded between them, commonly used to lift heavy loads, is a block and tackle or just tackle. To form blocks, the pulleys are assembled and blocks are then paired so that one is fixed and one moves with the load.
1.Mechanical advantage (MA)
The tension in the 7 segments (means 7 pulleys ) of the string supports the load L. Therefore, we have
L = 7 T
E = T
MA = L/E
= 7
Generally, if the total number of pulleys used in both blocks is n and the effort is applied in the downward direction, then the load is assisted by the tension in n parts of the string, so we have M.A = n
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