Block and tackle system formula

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SUMMARY

A block and tackle system with three pulleys in each of two blocks can achieve a mechanical advantage based on the number of rope strands. When a downward effort of 100 N is applied and the system has an efficiency of 83.6%, the maximum mass that can be moved is determined by calculating the effective force output. Key considerations include counting the number of strands of rope for mechanical advantage and recognizing that some pulleys may only redirect force without contributing to mechanical advantage.

PREREQUISITES
  • Understanding of mechanical advantage in pulley systems
  • Basic knowledge of force and mass calculations
  • Familiarity with efficiency concepts in mechanical systems
  • Ability to interpret physics problems involving pulleys
NEXT STEPS
  • Research "Mechanical Advantage in Pulley Systems" for detailed calculations
  • Study "Efficiency in Mechanical Systems" to understand energy losses
  • Learn about "Types of Pulleys and Their Functions" for better design choices
  • Explore "Force and Mass Calculations in Physics" for practical applications
USEFUL FOR

Students learning physics, engineers designing mechanical systems, and anyone interested in understanding the principles of block and tackle systems.

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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