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Kinematics- need some help please?

• Part A: Motion with Uniform Velocity In the first part of this experiment, you will examine the motion of a ball moving in a straight line at a constant speed (i.e., no acceleration). To begin, find an open area in which the ball can roll smoothly on the floor for several metres, with several metres clearance to the sides. Place the sensor on the floor pointing into the area where the ball will be rolling. Make sure that the sensor stays is stable (stays in place) during the experiment. Hold the ball still at about 0.5 m in front of the sensor (see Fig. 3.1). When you are ready, click the green "Collect" button in the Logger Lite program. You should hear the sonic pulses emitted by the sensor. Gently push the ball to start it rolling steadily in a straight line away from the sensor. The program will run for five seconds before the pulses stop. If the experiment is done properly, you should get a graph similar to the one in Fig 3.2. Note that you can change the data collection time and rate by clicking on "Experiment" in the menu bar and then selecting "Data Collection" from the scroll-down menu. Save the Logger Lite file containing the distance measurement versus time under an appropriate name. Print the graph and include it in your lab report. Repeat the procedure above for two additional situations. In the first one, allow the ball to move faster away from the sensor. In the second one, allow the ball to move gently towards the sensor. In this case, you will need an assistant at the other end of the room to push the ball towards you and the sensor. Your assistant should not move while the sensor is collecting data. Make sure to stop the ball before it hits the sensor. In each situation, save your data under an appropriate name. Part B: Motion with Uniform Acceleration Using the same connection as in Part A, place the sensor on the floor facing upward, and start the Logger Lite program. Hold the ball at least 0.5 m above the sensor, toss it upward in the air, and then catch it (see Fig 3.3). You will have to get your hands out of the way while the ball is in free flight. Practice this if necessary. Be careful not to let the ball touch the ceiling or drop onto the sensor. When you can perform this type of toss effectively, click the green "Collect" button in the Logger Lite program and immediately thereafter, toss the ball upward and catch it. Note that the ball should be at a height greater than 0.5 m above the sensor at all times. If the experiment is done properly, you should get a graph with a parabolic section similar to that in Fig 3.4. If you need to repeat the experiment, click the "Collect" button again and repeat the procedure above. Make sure to save your data file before starting the analysis. Analysis Part A: Motion with Uniform Velocity The Logger Lite program is mainly designed for data collection. Therefore, to analyze your data, you need to open the saved data file using the Graphical Analysis program. To do that, right-click on the saved file, select "Open With" from the scroll-down menu and choose the Graphical Analysis program from the list of applications. An alternative method is to drag the file and drop it on the Graphical Analysis application icon. Open the first data file that you saved in Part A using the Graphical Analysis program. Double click anywhere inside the graph window, click on the "Graph Options" tab and deselect the "Connect Points" option. This allows you to see the collected data points without the connecting lines. The interesting section of the graph, which corresponds to the position of the ball while in motion, is expected to be almost linear. Drag the mouse to highlight the data points of this section. Then, click on "Analyze" in the menu bar and selected "Linear Fit" from the scroll-down menu. This will generate the best fit linear graph for the selected data points and will calculate its slope and y-intercept (see Fig 3.5). Save this graph and include it in your lab report. Repeat this analysis for the other two situations. Estimate the average speed of the ball in each situation and comment on your results. Recall that the appropriate equation describing the motion of a freely falling object is described by Equation (3) above. Interpret the meaning of the fit coefficients A, B and C. What is the value of the acceleration due to gravity predicted by your experiment? Compare this to the expected value, and calculate the percentage difference. Calculate the quantity −B/(2A), including units. Can you give a physical meaning to this quantity? Assume that you were requested to move (walk or run) in front of the motion sensor in the Part A setup. Describe the motion that you need to make to produce the following graphs: line with a positive slope line with steeper positive s

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