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Day 16 4-11-11 Topic: Potential & Kinetic Energy Lab write up Objective: I will relate the Potential Energy to the Kinetic Energy of a CPO car rolling down a track. Science starter: 1.What is the kinetic energy of a student with a mass of 155 kg running on the track at a rate of 7 m/s? 2.What is the potential energy of a person sitting in the bleachers watching the track meet 15m high with a mass of 85kg?

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Sample Data Graph –20x20 –Height (IV) –Velocity (DV) –Graph for both masses Height (m)Mass (kg)T1T2T3TavgV (m/s)EgEk 0.120.0560.0066 1.51520.06580.0643 0.090.0560.0077 1.29870.04940.0472 0.060.056 - - - 0.01010.99010.03290.0274 0.030.0560.014 0.71430.01650.0143 0.120.083 - - - 0.00691.44930.09760.0872 0.090.083 - - - 0.00811.23460.07320.0632 0.060.083 -- - 0.00991.01010.04880.0423 0.030.083 - - - 0.01450.68960.02440.0197 Complete these calculations

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0.02.04.06.08 1.0 1.2 1.4 1.6 1.8 2.0

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Reflection: Using sentences to answer the following: 1.How did the E k & E g vary with increasing the mass of the car? 2.How did the E k & E g vary with changing the height of the trials? 3.Compare the E k & E g for each separate trial. Were they the same or different? Why or why not? 4.Is energy lost by rolling down the track? If so, what is the reason for this? 5.Think of one additional way to use the CPO car and track to compare E k & E g. Write your suggestion.

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