Systems of Pulleys

What is Systems of Pulleys? Differentiate first, second and third Systems of Pulleys.

The following three systems of pulleys are commonly used :

1. First system of pulleys. For such a system, velocity ratio is:
First system of pulleys
where
n = Number of pulleys

2. Second system of pulleys. For this system, velocity ratio:
Second system of pulleys

3. Third system of pulleys. For such a system, velocity ratio:
Third system of pulleys

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