Day 67: Modified Atwood

Screen Shot 2013-12-16 at 8.08.54 PM

 

A more dynamic view of this collage is available here

Today we were working on a problem (#4 in Practice 3 in here) and I wanted to investigate the situation a bit more closely. The problem is a modified atwood, and I had one set up with a wireless force detector on a cart, so the situation was different than the problem in that it was essentially frictionless. I showed students what the F vs. t graph looked like when I just held the cart (a horizontal graph, as F is constant). Then I asked them what would happen to that graph if I released the cart. The above is what they drew, below is what actually happens.

20131211_094744

After taking the above data students discussed why this occurs using qualitative free body diagrams of the hanging mass before and after the release.

##ufpm

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