Questions 1-3

2 Energy Graphs In the figure below is shown a w-shaped track. Five points along the track are marked with small circles (labeled A-F). The zero for the gravitational potential energy was taken at point C. The skateboarder starts at rest at the point labeled A and then then starts rolling down the track. For this problem, ignore friction and the rolling effects of the (small) wheels. 1. At which point on the track do you think the following bar graph was taken? Justify your answer. Total Kinetic Potential Thermal Adapted from the work of E.F. Redish and collaborators. Published at compadre. orgerusph and licensed under the CC BY-NC-SA. Phys 1335 Page 3 2. The graph below shows the skateboarder's various energies as functions of time. Where is the skate- boarder on the track at the various instants indicated? 2 1 4 Figure 2: Total is yellow; P.E. is blue; K.E. is green; thermal is red. 3. The skateboarder's mass is 60 kg. If they are moving with a speed of 5.5 m/s as they pass through point C, 3.1 meters above the lowest point on the track, how much higher is point A above the lowerst point