ICSE Class 10 Answered
WHAT IS BLOCK AND TACKLE PULLEY SYSTEM , HOW TO FIND THE MECHANICAL ADVANTAGE AND VELOCITY RATIO OF THE SYSTEM ALSO HOW TO FIND EFFICIENCY
Asked by Pushpanjali | 26 Jul, 2016, 09:44: PM
Expert Answer
BLOCK AND TACKLE: In this system of pulleys, two blocks of fixed pulleys are used. One block (upper) having several fixed pulleys is fixed to a rigid support and the other block (lower) having several fixed pulleys is movable. This is called the block and tackle arrangement.
The figure shows a block and tackle arrangement of 5 pulleys in which one end of the string is attached to the hook of the lower block.
Mechanical advantage: The tension in the five segments (figure a) of the string supports the load L. Therefore, we have
Therefore, the mechanical advantage is
In general, if the total number of pulleys used in both the blocks is n and the effort is being applied in the downward direction, then the tension in n segments of the string supports the load, therefore, we have M.A = n.
Velocity ratio: In a block and tackle system if the load moves up through a distance d, the effort end moves through a distance nd because each section of the string supporting the load is loosened by a length d, i.e., if dL = d, then dE = nd.
Therefore, we have
Answered by Romal Bhansali | 27 Jul, 2016, 09:52: AM
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