How does length affect the bending of a horizontal beam?

  • Thread starter Apothem
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Homework Statement



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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

Homework Equations


y is directly proportional to L3

The Attempt at a Solution


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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.
 
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Answers and Replies

  • #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.
 
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Did you figure it out?
 
  • #4
Matternot
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