Question

The Velocity Ratio (VR) of a block and tackle system of two pulleys with the effort in the upward direction is:

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

For any block and tackle pulley system, the Velocity Ratio (VR) is simply equal to the total number of pulleys used in the system.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
In a block and tackle system, the Velocity Ratio (VR) is determined by the number of strands of the string supporting the movable block.
Step 2: Key Formula or Approach:
If the effort is applied in the downward direction, \( VR = n \) (where \( n \) is the number of pulleys).
If the effort is applied in the upward direction, the effort strand itself contributes to lifting the load, so \( VR = n + 1 \).
Step 3: Detailed Explanation:
The system has \( n = 3 \) pulleys.
The effort is applied in the upward direction.
Therefore, \( VR = 3 + 1 = 4 \).
Step 4: Final Answer:
The Velocity Ratio is 4.