X WCLN.ca Physics Energy Energy Graphs (no friction) This graph was made with a 75 kg Skater riding back and forth on the half-pipe track shown. Without using the simulation, use this graphical data to predict the answers to the following questions. Record your predictions! Energy vs. Time 3,500 Thermal = 0.00 J KE =239.56 J 3,000 PE = 2678.67 J 2.500 2.000 Energy (Joules 1,500 .000 500 XXX 1 1, 3 -500 O . 2 10 11 12 13 15 .3 8, 1 Time (sec) 1. What types of energy does the "Total Energy" consist of? Kinetc potential 2. What is the magnitude (value) of the total energy throughout? 2 918.23, 3. The grey dotted line on the far right shows what the potential and kinetic energies of the skater are after 1 1.3 seconds on the half pipe. What do these two energies add to? PE + KE= 2918.23 J Explain why the answer above makes sense. gravitional Because the skater has more potential energy when his is at the top . As the Skater goes down it gets converted into kinetic energy. The energy, of motion PE AKE. At 11.3 seconds, was the skater closer to the bottom of the pipe or the top? Explain how you know . The Top. Because at 11. 3 seconds the potential energy is max. and the kinetic energy is minimum 4. Use the above graphs to answer the questions below. a. If(his maximum height is 4 m (measured from the bottom of the track), what is his height at the times below (approximate) zero seconds? 6.8 seconds? 8.1 seconds?_ 5.3 seconds?& 2021-07-12 Page 6 of 11