C why is it important for point a to be higher than

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c. Why is it important for Point A to be higher than Point C?
d. What causes the roller coaster train to lose energy over its trip?
Experiment 1: Work Done by a Spring In this experiment, you will investigate work done by a spring. Procedure 1. Calibrate the 5 N spring scale to zero. 2. Lay the ruler on the table with the centimeter scale closest to you. 3. Place the end of the spring with the circular hook next to the ruler so that the end of the spring lines up to the 0 cm mark on the ruler (Figure 7). Figure 7: Step 3 reference. Notice that the end of the free spring is lined up to the 0 cm mark of the ruler. 4. Hook the spring scale onto the circular hook of the spring. Make sure the Newton scale is visible so you will be able to make measurements. 5. Secure the spring by grabbing 10 coils from the opposite end of the spring. Note : It is important that you always secure 10 coils of the spring. If possible, do not let go of the spring while recording data. 6. Pull the spring scale until the end of the spring is stretched to the 5 cm mark on the ruler. Record the force reading on the spring scale in Table 1. 7. Repeat Steps 3 - 6 for stretching distances of 10, 15, 20, and 25 cm. Table 1: Spring Scale Force Data Materials Ruler Spring 5 N Spring Scale * Computer * Internet Access *You Must Provide
Force (N) Distance, x (m) ForceAverage (N) Δ Distance, Δ x (m) Work (J) 0 0 0.05 0.05 0 0.10 0.05 0.18 0.05 0.0045 0.25 0.10 0.33 0.05 0.0083 0.40 0.15 0.45 0.05 0.0113 0.50 0.20 .55 0.05 0.0138 0.65 0.25 Post-Lab Questions 1. Create a Force vs. Displacement (stretch distances) graph. Construct your graph on a computer program such as Microsoft Excel®. If you do not have a graphing program installed on your computer, you can access one on the internet via the following links: or . y = 2.7x - 0.025 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 0.05 0.1 0.15 0.2 0.25 0.3 Force (N) Distance, x (m) Force (N) vs Stretch Distance