EXSC 662 - Mechanical Analysis of Activity

Brigham Young University

These projects will be due one week after the assigned date

**#1: Vicon Instructions (work with a partner on this project if you would like to)**

**Creating a guide for using technology is very challenging. For using software, it is good practice to write the guide so that a third-grader could complete the task.**

- We will perform a calibration, data collection, and processing
- Your job is to take good notes and repeat what we do in class.
- Three tasks will be split between class members. You will create a written guide (with pictures or screen captures) so that a third-grader could come and do what we have done.

**Turn in your guides one week from today with you and your partners name on it (one copy for the pair of you is all that is needed).**

**#2: Velocity & Acceleration (work with one partner on this project)**

**This project is designed to help you learn to calculate velocity and acceleration from position and time data.**

- Save the horizontal and vertical position data from the ball we will drop in class and track with the Vicon system
- Bring the horizontal and vertical position data into a spreadsheet.
- Calculate the velocity and acceleration horizontally and vertically and create graphs of each (four graphs total).
- Answer the following questions
- What is the vertical velocity of the ball at the highest point of the flight?
- In theory, what should the horizontal acceleration of the ball be?
- In theory, what should the vertical acceleration of the ball be?
- Explain the discrepancies between the measured and theoretical accelerations.

**Email the spreadsheet to (iain_hunter@byu.edu). Turn in printouts of the four graphs and responses to the questions with you and your partners name on it (one copy for the pair of you is all that is needed).**

**#3: Angular Kinematics (work with one partner on this project)**

**You will learn in this project how angular momentum, angular velocity, and linear velocity all relate to each other in a tetherball game.**

- We will measure the position of a ball attached to a string attached to a post as it spins around. The string will wrap around the pole leading to a shortening radius.
- You will have a spreadsheet showing the radius and the position.
- Calculate the angular inertia, angular momentum, and angular and linear velocities.
- Create graphs of the above variables versus time.

**Turn in the spreadsheet (we will discuss the results as a group in class)**

**#4: Running Mechanics (work alone on this project)**

**This project will provide you the opportunity to practice using the Vicon system and pull information related to the mechanics of running as velocity is increased.**

- Take any data you are interested in from Vicon after the data collection is performed in class.
- Create a graph of some characteristic you measure and write up about 150 words discussing what you found.

**Turn in the responses to the questions and be prepared to discuss your project in class.**

**#5: DLT (work with one partner on this project)**

**This project will provide you practice with using Vicon Motus to perform a DLT and check the accuracy of it.**

- Follow the steps you learned in class for filming and digitizing a calibration in Vicon Motus (make sure you sign up for the computer through http://calendar.google.com)
- Film and digitize an object of known length within and without the calibrated area.
- Answer the following questions:
- How much did the actual length compare with the digitized coordinates?
- What methods will you use to obtain the most accurate data when using Motus?

**Turn in the responses to the questions and be prepared to discuss the answers in class.**