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Bathroom scale spring physics

  1. Oct 12, 2004 #1
    If you stand on a bathroom scale, the spring inside the scale compresses 0.50 mm, and it tells you your weight is 805 N. Now if you jump on the scale from a height of 2.0 m, what does the scale read at its peak?

    I used F=kx, and solved for k...but I don't know what to do after that...do I set

    mgh=kx, where m is 805/9.8 and h is 2.0m?
  2. jcsd
  3. Oct 12, 2004 #2


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    The idea is correct.
    At the point where the spring is compressed the most, all gravitational potential energy has been converted to potential energy in the spring.

    However, the energy stored in the spring is not kx.
  4. Oct 12, 2004 #3
  5. Oct 12, 2004 #4


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    Yes, physicss
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