To study the motion of an object under the influence
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1 L A B 3 FALLING OBJECTS First and Second Derivatives To study the motion of an object under the influence of gravity, we need equipment to track the motion of the object. We can use calculus to analyze the data. Calculus can be used to determine the object s position, velocity, and acceleration due to gravity. Observations In theory, the position of a free-falling object (neglecting air resistance) is given by s t 1 2 gt2 v 0t s 0, Purpose In this lab, you will analyze the data of a free-falling object collected during an experiment. You will use the first and second derivative and Mathcad to study the motion of the object. References For more information about experiments involving the study of motion of an object, see CBL Explorations in Calculus by Meridian Creative Group. where g is the acceleration due to gravity, t is the time, v is the initial velocity, and s is the initial height. 0 0 LAB 3 FALLING OBJECTS 1
2 Data The positions of a falling ball at time intervals of 0.02 second are given in the table below. Time (sec) Height (meters) Velocity (meters/sec) Scatter plots of the data are given below y Height of Ball (in meters) Velocity of Ball (in meters per second) y Time (in seconds) x Height (in meters) Time (in seconds) x The data in the table and the scatter plot are stored in the Mathcad file called LAB03.MCD Velocity (in meters per second) Mathcad Lab Manual for Calculus
3 Exercises Name Date Class Instructor 1. What Type of Model? What type of model seems to be the best fit for the scatter plot of the heights of the falling ball? What type of model seems to be the best fit for the scatter plot of the velocity of the falling ball? Describe any relationships you see between the two models. 2. Modeling the Position Function. A model of a position function takes the form s t 1 2 gt2 v 0 t s 0. Use Mathcad to find the position function of the falling ball described in this lab s Data and record the result below. Use this position function to determine the ball s initial height, initial velocity, velocity function, and acceleration function and record the results below. Position Function: s t Initial Height: s 0 Initial Velocity: v 0 Velocity Function: v t s t Acceleration Function: a t s t LAB 3 FALLING OBJECTS 3
4 3. A Good Fit? Is the velocity function you found in Exercise 2 a good fit? Why or why not? Use Mathcad to analyze the velocity function graphically and numerically. 4. Modeling the Velocity Function. A model of a velocity function takes the form v t gt v 0. Use Mathcad to find the velocity function of the falling ball described in this lab s Data and record the result below. Use this velocity function to determine the acceleration function and record the result below. Velocity Function: v t Acceleration Function: a t v t 5. What s the Difference? Of the velocity functions you found in Exercises 2 and 4, which one is a better fit to the data? Use Mathcad to analyze the velocity functions graphically and numerically. Explain why these velocity functions which describe the same data are different. 4 Mathcad Lab Manual for Calculus
5 6. Estimating Earth s Gravity. Of the acceleration functions you found in Exercises 2 and 4, which one is closer to the actual value of earth s gravity? 2 (Note: The value of earth s gravity is approximately 9.8 m/sec.) Calculate the percent error of the closest estimate of earth s gravity. Do you think this is a good estimate? Why or why not? Another Ball. For Exercises 7 9, use the following data. Time (sec) Height (meters) Time (sec) Height (meters) LAB 3 FALLING OBJECTS 5
6 7. Use Mathcad to find a model for the position function of the data and record the result below. Use this position function to determine the ball s initial height and initial velocity. Do you think this ball was dropped or thrown? Explain your reasoning. Position Function: s t Initial Height: s 0 Initial Velocity: v 0 8. Use Mathcad to analyze the graph of the position function s from Exercise 7 and its derivative s. For which values of the time t is positive? For which values of the time t is negative? What does the graph of tell you about the graph of s? s s s 9. Use Mathcad to analyze the tangent line to the graph of the position function s from Exercise 7 at different times. At what time is the slope of the tangent line horizontal? What is the velocity of the ball at this time? 6 Mathcad Lab Manual for Calculus
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