Momentum

Title: Energy in Roller Coasters Problem: How much energy is “lost” on a roller coaster-like track' Hypothesis: Due to the principle of conservation of energy, all energy should be conserved in some form. Most of the initial energy should be conserved, although error may occur. Procedure: 1. Place a metal marble on top of the roller coaster-like model. 2. Measure the height to the center of the marble. 3. Place two infrared timers along the track. 4. Measure the height of each location and record the distance down the track. 5. Roll the marble down the track and record data. 6. Repeat trial three times. 7. Repeat 3—6 four times. Materials: • Roller Coaster Track • Marble • Timers • Meter Stick Data: Distance, Height, and Time Trial Distance (cm) Height (cm) (±2mm) Time (s) (±.0005) 1 20 27 .0159 80 31.5 .0303 2 10 32 .0265 100 25 .0151 3 40 14.5 .0112 120 12 .0103 4 50 15.5 .0115 60 23 .0131 5 5 35 .0489 125 10 .0098 Initial 0 36.5 0.000 Vi=0, h=.365, m=m KE1¬¬ + PE1= KE2 + PE2 + Wf E¬total=1/2mv2 + mgh Etotal=1/2m(0)2 + m(10)(36.5) Initial Etotal¬=365m v = d/t where d = .019 Kinetic, Potential, Total Energy, and Work of Friction Trial Kinetic E Potential E Total E 1 79.4m 270m 349.4m 349m 315m 664m 2 7.22m 320m 327.22m 2190m 250m 2440m 3 637m 145m 782m 6790m 120m 6190m 4 946m 155m 1101m 1050m 230m 1280m 5 .500m 350m 350.5m 8140m 100m 8240m Percent difference. (PEi-TE)/PEi *100%