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Preliminary Physics Moving About Conservation Conservation of Momentum and Energy Aim: Experimentally demonstrate conservation of momentum and energy through a collision. Method: 1. Determine the instantaneous velocity of trolley 1 2. Calculate the initial momentum and energy of the system 3. Collide the trolleys 4. Determine the instantaneous velocity of trolley 1/2 5. Calculate the final momentum and energy of the system 6. Compare the initial and final momentum 7. Repeat with a larger mass trolley 2 Results: 1. Instantaneous velocity of trolley 1 Measure the distance/time travelled, calculate the average velocity, instantaneous velocity = 2 * average velocity. Trial 1 2 3 Average Displacement (m) Time (s) Average velocity = avg_u1 = Instantaneous velocity = u1 = 2. Calculate the initial momentum and energy Mass of trolley 1 = m1 = pi = m1u1 + m2u2 pi = pi = Ei = PEi + KEi +0 R Laugesen 16/07/2008 http://tinyrock.com Preliminary Physics Moving About Conservation Ei = 0 + (½m1u1 + ½m2u2) Ei = 0 + (½ * Ei = 4. Determine the instantaneous velocity of trolley 1/2 Measure the distance/time travelled, calculate the average velocity, instantaneous velocity = 2 * average velocity. Trial 1 2 3 Average Displacement (m) Time (s) * + 0) Average velocity = avg_v1 = Instantaneous velocity = v1 = 5. Calculate the final momentum and energy Mass of trolley 2 = m2 = pf = (m1 + m2)v pf = pf = Ef = PEf + KEf Ef = 0 + ½(m1 + m2)v2 Ef = 0 + Ef = 6. Compare the initial momentum and energy with the final moment and energy. Initial momentum: Initial energy: Conclusion: Final momentum: Final energy: R Laugesen 16/07/2008 http://tinyrock.com