![]() ![]() How does this compare with the value you obtained for the first 5 trials? In which average do you have greater confidence? Why? 9. Determine the average value of a g for all 25 trials. To do this, choose Options > Additional Graph Options>Histogram Options, and adjust the settings under the Bin and Frequency Options tab. In your discussion, you will decide how best to configure the features of the histogram so as to represent the distribution of your values in the most meaningful way. Enter your values of slope in the Table on page 19. Launch the Logger Pro file Lab02-histogram. Record the value of the slope in the Table on page 6. Since you are now investigating the variation in the values of a g, you need only record the value of the slope of the best-fit line to the velocity-time graph for each trial. Begin the data-collection program "Picket Fence" in folder Lab02 as you did before and drop the picket fence through the photogate another 20 times, bringing the total number of trials to 25. In order to better understand random error in measurement, you must return to your experimental apparatus to collect more data.ĥ. ![]() We'll address this later in the experiment. Errors in technique or in the calibration of your equipment could also produce systematic error. Every time you make a measurement, there is some random error due to limitations in your equipment, variations in your technique, and uncertainty in the best-fit line to your data. Your determination of the percent difference does little to answer such questions as, "Is my average value for a g close enough to the accepted value?" or "How do I decide if a given value is too far from the accepted value?" A more thorough understanding of error in measurement is needed. Note that if you simplify your units of slope, they will match those of the reported values of a g. ![]() How does your experimental value compare to the generally accepted value (from a text or other source)? One way to respond to this question is to determine the percent difference between the value you reported and the generally accepted value. How might you best report a single value for the acceleration due to gravity, a g, based on your results? Perform the necessary calculation. It is highly unlikely that you obtained identical values of the slope of the best-fit line to the velocity vs. How do you account for the fact that the values of the slope were nearly the same, whereas the values of the intercept were much more variable? The values of the slope were nearly the same because of the speed of the picket fence. How closely does the mean acceleration compare to the values of g found in Step4?ĮVALUATION OF DATA 1. Click and drag the mouse across the free-fall section of the motion and click Statistics. time should appear to be more or less constant. How closely does the coefficient of the t term in the fit compare to the accepted value for g ? 5. To fit a line to this data, click and drag the mouse across the free-fall region of the motion. time graph indicate? What is the significance of the slope of that linear segment? 3. What does a linear segment of a velocity vs. What was the velocity of the ball at the top of its motion? What was the acceleration of the ball at the top of its motion? 2. Mark the spot and record the value on the graph. time graph, locate the maximum height of the ball during free fall. time graph, decide where the ball had its maximum velocity, just as the ball was released. Determine the position, velocity, and acceleration at specific points. time graph I predicted that the ball would increase its speed as it falls down.Ĭ. The sketch below is a description of the acceleration vs. Sketch your prediction for the acceleration vs. When the ball bounces off the floor the graph will then have a negative spike going down indicating that the ball is going up. It first begins when the ball is dropped making a positive spike in the graph. The graph below shows the prediction of the velocity vs. Sketch your prediction for the velocity vs. When throwing the ball up, it reaches a maximum height at zero velocity. The graph above represents the motion of the ball as it travels straight up and down in freefall. Sketch your prediction for the position vs. Consider the motion of a ball as it travels straight up and down in freefall. Name: Rossel Meraz PID: 6131719 LAB 2: Ball Toss and Error Analysis Names: Kelly Castillo, Ahmed Martinez, Ronald Tejada, Rossel Meraz Preliminary questions: 1. ![]()
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