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How does length affect the bending of a horizontal beam?

  1. Mar 28, 2015 #1
    1. The problem statement, all variables and given/known data

    tGdlzvi.png

    We were shown this image ^
    We were later told that it is suggested that the depression (y), is directly proportional to the length of the beam cubed (L3). We were asked to give reasons why this is so.
    EDIT: The 1kg mass is placed at L/2
    2. Relevant equations
    y is directly proportional to L3

    3. The attempt at a solution

    I am rather confused, I think moments may be involved and we were told to consider the force acting on the metre rule. I know it isn't much of an attempt, but any guidance in the right direction will be extremely grateful.

    Thanks.
     
    Last edited: Mar 28, 2015
  2. jcsd
  3. Mar 28, 2015 #2

    haruspex

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    The thing to be proved is not a "relevant equation". The idea is to post standard equations that you might need to solve the problem. In the present context, should be something about bending moments.
     
  4. Mar 28, 2015 #3
    Did you figure it out?
     
  5. Mar 28, 2015 #4

    Matternot

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