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Spring Constant

  • Thread starter cooney88
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  • #1
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Q. An object of mass o.4kg slides at 8m/s across a frictionless path before striking one end of a spring that is fixed at the other end. the spring constant is 80N/m. the maximum distance, in metres, by which the spring compressed is : ans?




I a not sure wether to use hookes law (f=ks) or the kinetic energy formula Ek = .5kmv^2

when i used hookes law i got an answer of 0.04 but when i use the kinetic energy forumla i got 0.57. I know it doesnt really make any sense to use hookes law as u cant find the force, only the momentum (0.4x 8)

any help with this would be greatly apreciated



The Attempt at a Solution

 

Answers and Replies

  • #2
Doc Al
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It sounds like you're answering your own question. :wink:
 
  • #3
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so its the kinetic formula cos it wouldnt make sense to use the hookes law right? but since when can u have the spring constant in a kinetic energy formula?
 
  • #4
Doc Al
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so its the kinetic formula cos it wouldnt make sense to use the hookes law right?
Yes, you'll need to use energy conservation.
but since when can u have the spring constant in a kinetic energy formula?
Consider the potential energy stored in a compressed spring--that's where the spring constant appears.
 
  • #5
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cheers buddy
 

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