1) Describe your experimental set-up. Include a clearly labeled diagram that you can use to clearly define the variables involved (such as hand d). Make sure you represent the important aspects

of the experiment, including angles. 2) Identify the assumptions made when stating that your apparatus models the real- world problem. 3) Describe your procedure. Identify the things you'll keep constant, the quantity you'll change (which you should refer to as your "independent variable") and the quantity you'll measure (which you should refer to as your "dependent variable"). Think carefully about how you want to vary the independent variable so that you can test each hypothesis. 3 4) Discuss how you'll analyze your data to check each of the two predictions, and what outcome would either support or refute the underlying hypothesis of each group. • Recommendation: Make a scatter plot (or plots) of your results. Convention is to put the independent variable on the x-axis and the dependent variable on the y-axis. 5) Perform your experiment and report your data. The report should be clear and include units. Part 2: Analyze the data 6) Analyze each set of data using the procedure you described above. Include the analyses in your report. How does d depend on How does it behave as h goes to zero, and is that reasonable? 7) List any important factors that contributed to uncertainty in your results. Do you feel your results allow you to determine if one hypothesis works better than the other? Why? 8) Consider the assumptions you made when stating that your apparatus models the real-world problem, which you listed above. For each one, discuss what would happen if it weren't valid. Would the "real-world" distance tend to be smaller or larger than your prediction? Would this affect your recommendation on where to place the town? 9) Call your instructor, who will give you a specific value for the height of the boulder. Assuming you launch your steel ball from this point on your ramp, predict where it will land on the floor. Mark your predicted spot on the floor with tape or by holding a cup there. Before testing your prediction, ask your instructor to come watch. 10) With your instructor watching, launch the steel ball from the given height. Your goal is to have the ball land on the mark or in the cup. (With a cup, it might help to tilt it forward.) Adjust your target as needed and keep trying until you're successful. Part 4: Reflect on the activity This activity is meant to show how an experiment tests a hypothesis or model by checking a prediction. 11) What are the specific predictions being checked in this activity? What can you conclude about the validity of each group's model? Briefly defend your conclusions using the results of your experiment.