Derive conservation of mechanical energy for a simple spring.

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SUMMARY

The discussion focuses on deriving the conservation of mechanical energy for a simple spring using the equation of motion, -kx = ma. Participants highlight the necessity of integrating the right-hand side with respect to x, utilizing the Chain Rule to express acceleration as a function of position. This leads to the integral of (mv dv), which ultimately provides the required conservation of energy equation. The integration process is clarified, demonstrating the straightforward nature of the solution once the correct approach is applied.

PREREQUISITES
  • Understanding of classical mechanics principles, specifically Hooke's Law.
  • Familiarity with calculus, particularly integration techniques.
  • Knowledge of the Chain Rule in differentiation.
  • Basic concepts of energy conservation in physics.
NEXT STEPS
  • Study the derivation of Hooke's Law and its implications in mechanical systems.
  • Learn advanced integration techniques in calculus, focusing on variable substitutions.
  • Explore the application of the Chain Rule in different contexts within physics.
  • Investigate the principles of energy conservation in various mechanical systems beyond springs.
USEFUL FOR

Students of physics, educators teaching mechanics, and anyone interested in the mathematical foundations of energy conservation in mechanical systems.

Narcol2000
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Starting with the equation of motion -kx = ma , it is said that integrating this with respect to x gives the equation for conservation of mechanical energy.

Only problem is i don't see how to integrate the right hand side with respect to x...
 
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Narcol2000 said:
Starting with the equation of motion -kx = ma , it is said that integrating this with respect to x gives the equation for conservation of mechanical energy.

Only problem is i don't see how to integrate the right hand side with respect to x...

Hi Narcol2000! :smile:

Hint: use the Chain Rule to get a as a function of x:

a = dv/dt = (dv/dx)(dx/dt) = … ? :smile:
 
Turns into the integral of (mv dv) which gives the answer required... seems so easy looking back... :(

Thanks for your help.
 

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