Is energy profile of a spring asymmetric with +x and -x?

  • #1
16
1

Homework Statement


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[/B]

The problem is with part b(ii). This is an A level question so only elementary concepts are to be used.

Homework Equations


$$E = \frac{1}{2}kx^2 $$

The Attempt at a Solution



EPE should be max at 0, 0.4, 0.8 since E is a function of $x^2$. However, mark scheme only accepts 0 and 0.8 only. It is my understanding that energy profile of a spring is symmetric under compression and expansion, but if so, why is 0.4 not acceptable?
 

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Answers and Replies

  • #2
TSny
Homework Helper
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When the mass is hanging at rest as in part (a), does the spring have any elastic potential energy?
 
  • #3
16
1
Ah, right, I missed that. Thanks!
 

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