Day 71: A difficult problem, cool lab

2013-12-13 10.46.48

Above is student work where they are deriving a formula relating the distance d the middle mass drops as a function of the middle mass M. It is a good exercise for them to derive the formula, and a fun lab because the trend is usually very good (and it’s a nasty radical function that LoggerPro handles beautifully!) but there is significant systematic error.

Screen Shot 2013-12-21 at 10.08.29 PM

The lab is P3 from Lab III here, though I modified the handout to do the force analysis first and then substitute the lengths for sin(theta) later.


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