work-energy_lab - Elliot Marshall Phys 103-04 March 6 2008...

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Elliot Marshall Phys 103-04 March 6, 2008 Work-Energy Objective: To test and understand the relationship between work and kinetic energy, and observe the conservation of energy. Apparatus: Frictionless cart, PVC pipe, track, photo-gate timer, force sensor, computer equipment, masses, calipers, meter stick, balance. Procedure: Part 0: First we determined the coefficient of friction between the track and the PVC pipe by placing a 1 kg mass on the top of the PVC pipe and dragged it along the flat track with a string attached to the force sensor. By pulling at a constant speed we were able to see how much force it required to keep the pipe and mass at a constant speed and then calculate the coefficient of friction. Part 1: Next we set up the track to about 8 degrees above horizontal, measured the actual angle and recorded it. Then we set up the photo-gate timer to detect the small pipe off the top of the frictionless cart. Before we started testing the cart we had to figure out
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the effective diameter of the tube by running drill bits through the photo-gate sensor to calculate the smallest diameter it can detect. Then we measured the diameter of the tube and subtracted the minimum the sensor can detect to get the effective diameter of the tube. Then we began testing by placing the cart up the track at 6 different distances from the photo-gate beam and released the cart three times at each distance. The photo-gate beam gave us the time the tube was blocking the beam which we used to find the speed of the cart. Part 2: Then we repeated the test we did with the frictionless cart but this time placed the PVC pipe in front of the cart. We recorded 3 trials from the 6 distances. Part 3: Next we set up a pulley at the top end of the track and placed a string over it that was attached to the cart on the track and a mass. Then we placed the photo-gate beam so that it would record the speed of the cart just before the mass hits the ground.
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