A spring in an elevator

  • Thread starter nubshat
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  • #1
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A 1.6kg mass is suspended from a string in a stationary elevator. The spring stretches 12cm. The elevator now accelerates upward, and the spring extends a further 12cm. What is the acceleration in the elevator?
 

Answers and Replies

  • #2
116
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You should show you tried at least to solve the problem if you want an answer... if we know where you have the problem, we can help you understand it
 
  • #3
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Ignore this post
 
  • #4
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You should show you tried at least to solve the problem if you want an answer... if we know where you have the problem, we can help you understand it
I tried to solve it, but I'm not succeeding. So far I have managed to calculate the force constant of the spring, but I don't know what to do next
 
  • #5
116
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Ok then, if you now have the force constant of the spring you can pass to the accelerated elevator case... what happens when you observe an accelerated frame? Remember the equivalence principle, stating that an acceleration in one direction is equivalent to an additional gravitational field in the opposite direction... which "apparent" gravitational field do you need to elongate the spring further? How do you balance all the forces to be stationary again?
 
  • #6
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I tried to solve it, but I'm not succeeding. So far I have managed to calculate the force constant of the spring, but I don't know what to do next
Draw a free-body diagram for the mass and then use Newton 2.
 

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