How is the sag of a bridge affected by the load applied at it's mid-point?

... How is the sag of a bridge affected by the load applied at it's mid-point? Planning: This experiment is to see how the sag of a ruler, in millimeters, is affected by the weight put on it, the method of attachment, the method of support, the length of the ruler, the width of the ruler and the thickness of the ruler. Preliminary Work: I will do a series of experiments using a 1kg weight to try and determine the best: a) Length of ruler. b) Width of ruler. c) Thickness of ruler. d) Method of support. e) Method of attachment. The best results are the ones, which give the greatest sag. Firstly I did an experiment to check which constant length of ruler I should do: Length (cm) Sag (mm) Wooden: 100 150 80 100 60 50 40 22 20 18 Plastic: 100 185 From this graph I can now see that using a 100cm plastic ruler will give me the best results. I will now find out the best width to use by putting two or more

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