Energy extraction help requested

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    Energy Extraction
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SUMMARY

Energy cannot be extracted from a static force without displacement, as confirmed by user Mapes in the discussion. The inquiry focused on whether usable energy can be derived from a mechanism exerting force without movement, exemplified by pressing a book against a wall. When a minimal displacement of 0.25mm is introduced, piezoelectricity emerges as a viable method for energy extraction, alongside leveraging a lever to amplify displacement for other generators. These insights clarify the limitations and potential methods for energy harvesting in static scenarios.

PREREQUISITES
  • Understanding of static force and energy concepts
  • Familiarity with piezoelectricity and its applications
  • Knowledge of mechanical levers and their function
  • Basic principles of energy conversion and harvesting
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  • Research piezoelectric materials and their energy conversion efficiency
  • Explore mechanical lever systems for amplifying small displacements
  • Investigate energy harvesting techniques and technologies
  • Study the principles of static force and its implications in physics
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Engineers, physicists, and researchers interested in energy harvesting technologies, particularly those exploring static force applications and piezoelectric systems.

zydubion1
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My basic question is this. Can usable energy be extracted from a mechanism that has force only, no movement. Here is an example. You press a hard cover book against a wall. You now lean into the book thus there is static force against the wall. There is no movement, just force. This happens over and over, you release the force and re-apply the force over and over, the book never moving to or from the wall. How can one extract the force and convert it into usable energy? I realize energy can not be created, only converted. How can the weight of my body exerting force to the wall via the book be extracted without movement?
 
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Hi zydubion1, welcome to PF. The basic answer is: no, energy cannot be extracted from force without displacement.
 
Thanks Mapes. Next question: If one could get a very small displacement, say 0.25mm, what are some of the best ways to extract usable energy when such small displacement is available?
 
Hmm... the first thing that comes to mind is piezoelectricity, which employs very small displacements. Alternatively, a lever might be used to amplify the displacement for use with other types of generators.

You might also get some ideas http://en.wikipedia.org/wiki/Energy_Harvesting" .
 
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Mapes...Thanks for your help. I will start doing some homework based our your suggestions.
 

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