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Homework Help: A srping task

  1. Oct 22, 2007 #1
    1. The problem statement, all variables and given/known data

    Preliminary questions:

    1. John's weight is 618 N. He is sitting on a bosun's chair which is suspended from a spring. John's feet are pressing vertically down on a bathroom scale which reads 45 kg. What force is John exerting on the bathroom scale?

    Correct, computer gets: 441 N

    2. What force is John applying to the spring?

    Correct, computer gets: 177 N

    The spring task:

    Here is a table of the force applied to a spring and the resulting extension, Δl.

    Force (N) Δl (m)
    281 0.10
    358 0.15
    685 0.30
    1012 0.45
    1089 0.50

    Plot a graph of Force vs. Δl.
    What is the spring constant? If you don't plot a graph (or use a fitting program), you will get wrong answers. Plot the graph and see why.

    2. Relevant equations

    Not sure.

    3. The attempt at a solution

    I've plotted a graph, and came up with Δl = 0.4. Then I devided 177 N by 0.4, but the resulting answer wasn't correct.
  2. jcsd
  3. Oct 25, 2015 #2
    just plot the graph on excel and get the equation of the line. you will something like this y=2034x+54. the 2034 will be your spring constant
  4. Oct 25, 2015 #3


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    Science Advisor
    Homework Helper
    Gold Member

    I doubt leloup is still waiting for an answer after 8 years.
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