# EXCEL EXERCISE AND ACCELERATION DUE TO GRAVITY

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1 EXCEL EXERCISE AND ACCELERATION DUE TO GRAVITY Objective: To learn how to use the Excel spreadsheet to record your data, calculate values and make graphs. To analyze the data from the Acceleration Due to Gravity Experiment by means of a computer and a spreadsheet program and to learn the treatment of experimental errors. Part 1: EXCEL EXERCISE EXERCISE 1. Entering Data and Calculations in Excel Fifteen students of a Physics Class are observing a pendulum that is swinging back and forth. Each of them was holding a stopwatch and each one timed the pendulum as it makes 10 swings back and forth. The time recorded by each student is shown below. Measurements in seconds: a) Enter the data in column A of Excel: Using the top row of first column (cell A1), type in Time for 10 swings, (sec) to identify the data and its unit. You may need to widen your column. On the second row (cell A2), start typing in the data. b) Calculate the period T of the pendulum using Excel, where T = (Time for 10 swings)/10: On the top row of Column B (cell B1), type in Period T, (sec). Equations in Excel always start with the = sign. On the second row of column B (cell B2), input the equation =A2/10 and hit Enter. You just divided your first time measurement (20.5 sec) by the number of swings (10) which gave you a period T = 2.05 seconds. Now, Excel makes it easy for you to calculate the rest of the periods. Go back to cell B2. Note the little square on the bottom right corner of the cell. With your mouse, left click on that square and drag it down to the cell beside the last data entry, i.e., B16, then release. This translates the equation for the period T to the selected cells and instantly calculates the rest of the periods.

5 addressed in the analysis of your experiment. In the next activity (c), the Linear Regression feature of Excel will be utilized to plot the Velocity vs. Time data. c) Plot Velocity and Time using Excel s Linear Regression. To plot using Linear Regression go to Tools Data Analysis Regression. In the window that comes out, click on Input Range Y go to the column for Velocity, click on the top cell (i.e. the column title Velocity V (cm/sec)) and drag the mouse down to the last data cell. This defines the values to be plotted on the y axis. Click on Input Range X go to the column for Time and click the top cell and drag the mouse to the last data cell defining the values to be plotted on the x-axis. Note in this case that we have included the column titles in the range. Click on Labels specifying that the range includes the data labels. Also click on Line Fit Plots Residual Plots New Worksheet Ply OK. This gives two plots and some tables of statistical values. The Line Fit Plot shows the graph of velocity and time. The actual values of velocity are plotted in dark blue while the best fit values are in pink. (Note the plot titles include the variable plotted along the x axis, i.e. Time, t (sec) Line Fit Plot). The Residual Plot show how each of the actual values of velocity differed from the best fit values. The residuals (difference between the measured and best fit values) are shown in the Residual Output. The table which has Coefficients and Standard Error columns gives us the values of the intercept b and the slope m and their associated uncertainties. Click on the Residual Plot and drag it beside the Residual Output Table. Click on the Line Fit Plot and reposition it below the Residual Output Table. Resize the Line Fit Plot to make it big. Right click on a best fit point (pink) and Add a Trendline which is Linear and Display Equation as done in activity (b). Go back to the top of the page and again, type in your names at a convenient location. d) Adjusting the page before printing. To avoid having tables and graphs cut off, check out the Page Break Preview before printing. To do this, click on an empty cell then go to View Page Break Preview. Read the message window that pops out and click OK. The solid blue line defines the whole range to be printed. The dashed blue lines define the boundaries of each page. If any dashed blue line cuts through a plot or data table, adjust the page size by clicking on the dashed blue line then dragging it out. Reposition the Line Fit Plot so that it is entirely on the second page. Make sure the tables and plots are all contained in two pages before printing a copy for each group member. e) Finding the slope and intercept and their uncertainties. On your print out, circle the number labeled Intercept under Coefficients. This is the value of the intercept b in the equation y = mx + b. Circle the number labeled Time t (sec) under Coefficients. This is the value of the slope m. The uncertainties for the slope and the intercept are the corresponding numbers beside each of them under the column Standard Error. Identify and encircle each of these uncertainties on the print out. f) Inspecting the residuals of the data plotted. Look at the Residuals Plot. Write a comment on your print out on whether the points are equally scattered above and below the best fit line. Are there stray points or obvious outliers or possibly a point which was entered erroneously?

6 PLOTTING ERROR BARS Error bars on a graph describe the uncertainty in the measurements. The error bars can represent how confident one is in saying that a plotted point truly represents the value of the quantity being studied. One way to represent the error bar in a measurement is the standard deviation. However, when the averages or means (each taken from several measurements) are used represent the values plotted in the graph, the standard deviation of the mean (also called standard error) is used to represent the error bar for each point. The standard deviation of the mean is calculated by dividing the standard deviation by the square root of number of measurements N that make up the mean. i) Plotting errors bars using Excel. Consider the following data where the velocity of sound was determined by using a resonance experiment conducted at 3 different temperatures (10 o, 20 o and 30 o ). Making at least five trials for each case, the results are shown as follows: Temperature (C) Velocity of Sound (m/sec), 5 trials Average Velocity Standard Deviation Standard Deviation of the Mean Use the knowledge you have already learned enter the data into Excel, then calculate the average velocity, standard deviation and the standard deviation of the mean for each set of trials (adjust to two decimal places). The standard deviation of the mean (or standard error) can be calculated by entering the equation (=cell no. of the Standard Deviation/sqrt(N)) where N = 5 for this data set. Highlight the 3 values of Temperature. Press the Ctrl button and highlight the 3 values of Average Velocity. Click on the Chart Wizard and plot these two quantities by using the xy scatter option, label accordingly and place as object in sheet 1. Resize the graph if it is too small and position it under the data table. The values of the Standard Deviation of the Mean will be used to put error bars on each of the plotted points. Click on one of the plotted points click on Format Data Series Y Error Bars Both Custom. Click on + and highlight the 3 values of the Standard Deviation of the Mean to specify the values for the error bar. Click on - and also highlight the 3 values of the Standard Deviation of the Mean then click OK. The errors bars should now be seen on the plotted points. The longer error bars show that there is a wider range in that particular value, hence less confidence in that mean value representing the real value of that quantity. Also note that the standard error grows smaller as the number of measurements N is increased, and the confidence in the mean value increases. If the error bars of one point overlaps with the error bars of another value, there is a lower likelihood that these two values differ significantly.

7 Type in your names on a convenient location on the sheet. Make sure that the table and plot are all in one page by checking the Page Break Preview before printing a copy for each member of the group. TURN IN THE FOLLOWING TO GET CREDIT: the data table for Exercise 1, the data table for Exercise 2, the Excel graph with the corresponding equation of the line, the plot using the Linear regression, and the plot with error bars. NOTE: Keep these exercises in mind as they will be greatly utilized in the data recording, calculations and graphing requirements of several lab experiments done in this course. Part 2: ANALYZING THE ACCELERATION DUE TO GRAVITY DATA I. Brief Comments on the Treatment of Experimental Errors Experimental error or uncertainty is inherent in any experimental result at some level, however small. It is set by a combination of the design of the experiment, the quality of the apparatus and the skill of the experimenter. Generally it is possible to separate the sources of experimental errors into two categories: random and systematic. A. Random Errors The existence of random errors in a measurement can be inferred if repetition of the measurement does not give the same result each time. By definition, random errors are those that tend to average out upon repetitions of the measurement. For random errors then, the more repetitions of a measurement the less the uncertainty in the resulting average. From the mathematics of statistics it can be shown that the uncertainty due to random error in the average of N measurements decreases as when N is "large". Thus 400 measurements should give an average with half the uncertainty due to random error as compared to 100 measurements. The first step in treating the random error in a large number N of repeated measurements is to calculate the average. The average is the desired result and it is the uncertainty of the average due to random errors which must then be determined. If the N measurements are labeled y 1, y 2, y 3,... y N the average as denoted by as: is defined (The average is also sometimes called the mean in statistics.) To establish the uncertainty in the average, the usual procedure is to first calculate what is called (sigma), the standard deviation of measurements. If it is believed that no

8 one measurement is more accurate that any of the others (as we will assume) then is defined by: The significance of is that any one additional y measurement has about a 2 in 3 chance of falling between ± of the average,. Statistical analysis further shows that the average, has about a 2 in 3 chance of falling within ± of the true value. Thus, after specifying the average of N repeated measurements, it is common to append ± as a measure of the uncertainty due to the randomness of the measurements. Example Suppose you have the following 5 measurements of the same quantity. Note: One or two more decimal points must be kept in the calculations than are in the data until the calculations are complete. The standard deviation of these measurements is: The uncertainty in the average is = The result is then ± At this point some rounding off is appropriate and the result would be reported as 1.04 ± 0.01 or possibly as ± It should be pointed out that the number 5 is stretching the concept of large N beyond reasonable bounds but that this is common practice when a large number of measurements are not available.

9 B. Systematic Errors A systematic error is one which tends to repeat and thus create a shift in the average from the true value. Systematic errors may be provided by the experimenter, the apparatus or by poor design of the experiment. Because they are not revealed by repeated measurements, care must be exercised to investigate and account for all possible sources of systematic errors. This can be very difficult to do. Such errors sometimes remain unknown until other experimenters with other apparatus obtain convincing evidence that a previous result is off by more than the originally reported uncertainty. II. Computer Analysis of Your Data for Acceleration Due to Gravity Using Excel, enter in separate columns the measured distances D in cm between the successive timing marks and the corresponding time t in seconds (i.e. 1/60, 2/60, 3/60, ) obtained last week. Identify each column with the name of the quantity entered and the units they are in. Note that you made three separate runs in last week s experiment. (Each run can be entered in a separate Excel sheet.) Make sure to identify each run and that the mass of the cart m 2, mass of the pulling weight m 1, and the mass of the hanging weight m used to determine the friction force for each run are properly recorded and identified in your data table. In another column, calculate the velocity v for each time interval by dividing D by 1/60 sec which is the length of each time interval corresponding to D. Graph v versus t using the Regression feature of Excel which can be obtained from Tools Data Analysis menu. The time t should be plotted on the x-axis and the measured distances D on the y-axis. Make sure to click on the boxes for Residuals, Residual Plots, Line Fit Plots and New Worksheet Ply to produce the information and graphs that you need for analysis. Repeat the calculation of velocity v and the graphing instructions on this paragraph for the other 2 runs. A. Interpreting the Results Inspect the Line Fit Plot and check how well the measured values of the velocity v plotted on the y axis coincide with the Predicted Y on the computer fitted line. Inspect the Residuals and the Residual Plot. Are your residuals reasonable or are there obvious outliers or data points that are possibly entered in error? Go to your Line Fit Plot. Add a trend line and display the equation of the best fit line for v versus t. Get the slope of this line (what does this slope represent?). Also determine the uncertainty in the slope by inspecting the resulting tables. Repeat all of the above for each of the runs. Tabulate the obtained values for acceleration a and its uncertainty. Calculate the value of the acceleration due to gravity g using the values of acceleration obtained from the Excel graphs. Tabulate these 3 values of g. Calculate the standard deviation of the three measurements of g as a measure of its uncertainty due to the randomness of the measurements.

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