Deriving the Elastic Energy Equation: How Do I Go from F=kx to F=1/2kx^2?

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SUMMARY

The discussion focuses on deriving the elastic energy equation from the force equation F=kx. The correct elastic energy equation is expressed as F=1/2kx^2, which represents the work done on a spring as it compresses or extends. To derive this equation, one must calculate the work done by the variable force F=kx as the spring is compressed from 0 to a final displacement X. This requires the application of calculus to find the area under the force versus displacement graph.

PREREQUISITES
  • Understanding of Hooke's Law (F=kx)
  • Basic calculus concepts, particularly integration
  • Knowledge of work-energy principles
  • Familiarity with graphical representation of force and displacement
NEXT STEPS
  • Study the process of integrating variable forces in physics
  • Learn about the area under a curve in relation to work done
  • Explore the relationship between force, displacement, and energy in spring systems
  • Review examples of deriving energy equations in mechanics
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Students studying physics, particularly those focusing on mechanics and energy concepts, as well as educators looking for clear derivations of elastic energy equations.

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Homework Statement


Derive an equation for elastic energy, in terms of k and x. Show all steps.

Homework Equations


F=1/2kx^2

The Attempt at a Solution


I believe Force=1/2kx^2 is the answer but how would I show steps to get an elastic energy equation? Basically, going from F=kx, what steps do I need to take to go from that equation to the elastic energy equation.
 
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You need to find the work done by the F = kx force as it compresses the spring (or as the spring pushes with that force on some other object). x will vary from 0 (meaning no compression or extension) to some final value X. It would be easy if F didn't vary with x. Since it does vary with x, you will have to use calculus or some kind of workaround. Perhaps you can find a definition of work involving the area under a force graph.
 

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