Friday, April 17, 2015

13-April-2015: Magnetic Potential Energy Lab

Purpose: We are going to demonstrate conservation of energy for a magnetic system.

The apparatus will be a frictionless cart with a magnet attached to it and on the other end another magnet of the same polarity.








We will raise the apparatus five times measuring five different angles and measuring  five different lengths from magnet to magnet (r).

For magnetic PE we will need to derive an equation we can use.

Plotting a graph of Force vs. R. Power fitting the curve gave us values for our "A" and "B".



To verify conservation of energy we leveled the track. With the air off placed the cart on the air track close to the magnet. Record data on logger pro and determine the relationship between the distance the motion detector reads and the separation distance of both magnets.




We made a graph with both KE and PE of the magnet and total energy vs. time.




Generally we were suppose to conserve the magnetic potential energy with the system. The idea was that KE and U mag give us a total of zero slope. Indicating to us that magnetic potential energy can be conserved. Varying obstacles leave some gaps in the experiment and explains why our line of total on the graph is not quite right.

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