Block and tackle system formula

AI Thread Summary
A block and tackle system with three pulleys in each of two blocks can effectively multiply force applied. To determine the maximum mass that can be moved with a downward effort of 100 N and an efficiency of 83.6%, it's essential to calculate the mechanical advantage by counting the number of rope strands. Additionally, it's important to differentiate between pulleys that contribute to mechanical advantage and those that merely redirect force. Understanding these principles is crucial for solving similar problems. The discussion emphasizes the importance of these factors in calculating the system's performance.
shelli8
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Hi, I had some luck on this forum before, and here I am stumped again. Hey, I am just learning this stuff. I am not even necessarily looking for an answer, I can't find a formula for this one. It says "A block and tackle system has three pulleys in each of two blocks. If a downward effort of 100 N is applied and the machine has an efficiency of 83.6%, what is the maximum mass that can be moved?" The answers are in kgs. Any thoughts or ANYTHING appreciated!
 
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Its okay, I got the answer.

thanks anyways!
 
In any case, there are basically 2 things to remember:

1. Count the number of strands of rope. Thats the factor you multiply force by and divide distance by (aka "mechanical advantage")
2. Be careful of pulleys that serve only to re-direct force, but don't add to the mechanical advantage.

Welcome to the board.
 

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