PHYS6AL Lab 3 (Energy Transformation)

PHYS6AL Lab Notebook Fall Semester 2021 Annie Lee and Davis Smith Instructor: Popescu, Berenstein TA: Leo Zhu Lab 3: Energy Transformation Exercise 1: The kinetic energy came from the potential energy stored in the band as it was being pulled back. Exercise 2: a) PE = mgh = m * 9.8 * 0.34 PE = 3.332m b) sin(30) = 0.34/x xsin(30) = 0.34 x = 0.68 R - x = 1.32 m c) W = (½)mv² W = -ΔU v = 2.581 m/s Activity 1 / Exercise 3: Data Points Time (s) Distance (m) Velocity (m/s) Height (m) Kinetic Energy (J) Potential Energy (J) 1 0.2 0.054 0.277 0.00054 0.00825 0.00114 2 0.6 0.150 0.219 0.00150 0.00516 0.00316 3 0.9 0.212 0.189 0.00212 0.00384 0.00447 4 1.2 0.265 0.163 0.00265 0.00286 0.00559 5 1.5 0.311 0.140 0.00311 0.00211 0.00656 6 1.8 0.349 0.116 0.00349 0.00145 0.00736 7 2.1 0.379 0.086 0.00379 0.00080 0.00799 8 2.4 0.401 0.058 0.00401 0.00036 0.00846 9 2.7 0.415 0.035 0.00415 0.00013 0.00875 10 3.0 0.421 0.010 0.00421 0.00001 0.00888

Block Height b (m) 0.01 Distance Between Legs D (m) 1 Exercise 4: a) b) As the kinetic energy decreases, the potential energy increases (and vice versa). They intersect at around 0.8 to 0.9 seconds, or when the energy is around 0.004 J. Exercise 5: a) Yes, our data does support the Law of Conservation of Energy. b) Our data leads us to believe this because as the kinetic energy decreases, the potential energy increases to keep the total energy in the system constant. If the values of kinetic and potential energy are added at any point in the graph, they will always be pretty much the same no matter at what point in time.