Using an atwood machine with 2 masses, If we had a heavier string (ms = ~1 g) an

Question

Using an atwood machine with 2 masses, If we had a heavier string (ms = ~1 g) an upward slope would appear in the v-t graph (it would curve upwards slightly).
A.)What would account for the overall upward curvature of the v-t graph?

If we use the same setup with one simple change we can come up with a way to measure the coefficient of friction between a mass and the lab table. We use the same measures v vs. t graph but place the pulley system near the edge of the table with one mass hanging off the end (m1) and one mass resting on the table (m2). The mass m2 is able to slide towards the pulley system as m1 drops towards the floor (away from the pulleys).
B.) If the force of friction between m2 and the table is Ffr=µm2g come up with a theoretical equation to figure out µ

Explanation / Answer

http://en.wikipedia.org/wiki/Atwood_machine This page helped me get an A on my test

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