# In reference to an basic atwood pulley physics lab…

### Question Description:

20.50

In reference to an basic atwood pulley physics lab; 1. If we had used a heavier strong, the graphs (velocity vs. time) would not have been exactly linear, but would of curved slightly. Why? Which way would it curve? Hint: Think of acceleration at the beginning and acceleration at the end. 2. explain why a traction elevator uses a counterweight and discuss how they set the mass of the counterweight (reference to Newtons’ 2nd law of translation). 3. If we use the same setup as in lab with one simple change we can some up with a way to meaure the coeeficient of friction between a mass and the lab table. We use the same computer program (measures v vs. t) but plave 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). If the force of friction between m2 and the table is F=umg2, come up with a theoretical equation to figure out u (you can assume that you can get the same style of data that you did in this lab, that is, graphs, masses, etc.)