Overview
1. If an object is moving with constant acceleration, what is the shape of its velocity vs. time graph? 2. Does the initial velocity of an object have anything to do with its acceleration? For example, compared to dropping an object, if you throw it downward would the acceleration be di erent after you released it? 3. Table 1: Five measurements of the acceleration due to gravity using the slope of the velocity vs time graphs and the average value of the acceleration graph. After nding the average of the slopes, nd the absolute error in the slope for each trial ( slope = trial value average) and the mean error in the slope measurements. Also calculate the average of the acceleration values from the acceleration graph and its corresponding uncertainty. Trial slope ( m s 2 ) slope ( m s 2 ) a a ( m s 2 ) 1 2 3 4 5 Averages 4. The slope of a velocity vs time graph is acceleration; in this case, the acceleration due to gravity (g). Report the measured value of g and its uncertainty in the format g g, rounded appropriately. 5. For each trial in Table 1, compare the acceleration obtained from the slope of the velocity vs time graph with the average value from the acceleration graph and state whether the slope and the average value are consistent (yes or no). Explain brie y what criteria you used to determine whether the values are consistant or not. Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 6. Which value for the acceration is the most precise; the average value from an individual trial or the average value of all ve trials? Explain brie y. 7. What is the percent error in the precision of the acceration obtained from the slopes? 8. What is the percent error in the accuracy of the acceration obtained from the slopes? Use 9.80 m s 2 as the expected value. 9. Is the measured acceration due to gravity obtained from slope in the ve trials accurate? Explain brie y. 10. The variation in the acceration due to gravity worldwide is around 0:03 m s 2 . Is this experiment sensitive enough to determine the local value of g at one location versus another? Why or why not? Explain brie y.