Homework Help: Spring stiffness

Posted by Henri on Wednesday, April 22, 2009 at 7:54am.

A spring has stiffness of 100Nmm, the initial compression of the spring is 15mm, and it is then compressed to 65mm.
a)Find potential energy at 15mm:
K=100Nmm*1000=100000Nm
Ep=Kc^2/2
Ep=(100000*0.015^2)/2
Ep=11.25 joule (ans.)
b)Find Ep at 65mm:
Ep2=(100000*0.065^2)/2
Ep2=211.25 joule(ans.)
c)Find the work done during compression:
W.D.=Ep2-Ep1
W.D.=211.25J-11.25J
W.D.=200Joule

Physics? - Writeacher, Wednesday, April 22, 2009 at 8:01am
assistance needed

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Spring stiffness - drwls, Wednesday, April 22, 2009 at 8:02am
I agree with your numbers.
Spring stiffness - Henri, Wednesday, April 22, 2009 at 8:34am
Thanks drwls... could you check the next one please

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