physics_6_questions

physics_6_questions - kinetic energy. Therefore, the sum of...

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QUESTIONS: 1. Make a summary table showing the results of your three trials in testing the law of conservation of energy. Included in this table should be: the approximate angle, the magnitude of the potential energy lost by the cart, the kinetic energy gained by the cart, and the percent difference between the magnitude of the potential energy lost by the cart and the kinetic energy gained by the cart. Angle (°) ΔPE (J) ΔKE (J) % difference (%) ~8 0.522 0.513 ±2 ~12 0.747 0.743 ±0.7 ~16 0.974 0.919 ±6 2. Considering the errors in your experiment, are your results in agreement with conservation of mechanical energy? That is, considering errors, was the potential energy lost by the cart equal to the kinetic energy gained by the cart? The law of conservation of energy states that the total amount of energy in an isolated system remains constant over time. The only thing that can happen to energy in a closed system is that it can change form: for instance potential energy can become
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Unformatted text preview: kinetic energy. Therefore, the sum of all the energies in the system is a constant. 3. If friction has been present, would this have affected the loss in potential energy of the cart? If so, how? Loss in potential energy of the cart would not have been affected. Since potential energy is the energy possessed by an object because of its position (motion is not involved), friction would be irrelevant in calculating potential energy. If friction had been present, would this have affected the change in kinetic energy of the cart? If so, how? Yes, when contacting surfaces move relative to each other, the friction between the two objects converts kinetic energy into thermal energy. Friction opposes motion, decreasing velocity until the motion of the object comes to a stop. = KE 12mv2 Since kinetic energy and velocity are directly proportional, a decrease in velocity results in a decrease in kinetic energy....
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This note was uploaded on 03/26/2011 for the course PHY 210 taught by Professor Mcdemus during the Spring '11 term at Lehigh Carbon CC.

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physics_6_questions - kinetic energy. Therefore, the sum of...

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