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

This project is designed to test your knowledge on using the Peak Motus System and how to calculate velocity and acceleration. You will learn new knowledge of how a filter can help improve your data analysis.

• How to complete the project
  • Film an activity of your choice
  • Film a scaling rod using the setup we talked about in class
  • Capture the video of the activity and scaling rod into Peak Motus
  • Digitize the scaling rod and one point on the body or object
  • Complete the "Process Wizard" in Peak Motus selecting "Yes" for Filter scaled coordinates
  • Export the "3D Transformed Coordinates" and open the exported file in Excel
  • Calculate the velocity and acceleration for one axis (horizontal or vertical) and graph the velocity and acceleration columns
  • Back in Peak Motus, export the "unfiltered" and open the exported file in excel
  • Calculate the velocity and acceleration for one axis (horizontal or vertical) and graph the velocity and acceleration columns
  • Print page 1 of each spreadsheet including the graphs

#2: 3D Kinematics (work with one partner on this project)

You will learn how to obtain 3D data for description of motion using Peak Motus. You will also get an idea of the accuracy of these types of data collections.

• How to complete the project
  • Perform a survey pole calibration to cover a space of about 3m x 1m (the survey pole calibration spreadsheet is on the desktop of the Peak computer)
  • Film the calibration with two cameras keeping in mind what we discussed in class about camera placement & settings (shutter speed, manual focus, iris,...)
  • Open the main doors of the lab and hang a net over them
  • Throw a tennis ball as fast as you can towards the net while filming
  • Have your partner measure the velocity of the ball from behind the net
  • Digitize the tennis ball throughout the time that it is moving through the calibration
  • After processing the data, obtain the velocity of the ball from digitizing
  • Write half a page, single-spaced, comparing the velocity from the radar gun to the calculated velocity and discussing issues and ideas you learned about how to accurately obtain 3D data

#3: Center of Mass (perform this homework individually)

This project will provide you practice with calculating center of mass. You will learn the equations and understand what the computer does to calculate center of mass. As you complete this assignment, be thinking about the sources of error in the calculation.

• How to complete the project
  • Enter the numbers from this picture into a spreadsheet
  • Using calculations from the book and in class, determine the center of mass location of the left leg. This spreadsheet may help you, although there are some differences to be aware of with the example spreadsheet. I'll talk about those differences in class.
  • Print out the spreadsheet and write a paragraph on what you think about the accuracy of the calculation.

#4: Ground Reaction Forces (work with one partner on this project)

This project will provide you practice with obtaining and analyzing ground reaction forces.

• How to complete the project
  • Use the center of pressure program on the force collection computer to record and save three trials of running (slow, medium, and fast)
  • Import the data into a spreadsheet and calculate vertical impulse, braking impulse, and propulsive impulse
  • Compare the center of pressure graphs for each trial
  • Turn in a paper showing the impulses for all three trials and describing how the center of pressure graphs differed between trials

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

This project will provide you practice with obtaining and analyzing EMG signals.

• How to complete the project
  • Setup the Biopac Acknowledge software to collect an EMG signal of the biceps brachii.
  • Hold the dumbell at 30°, 60°, 90° and 120° for 3 seconds while collecting data
  • Use the Acknowledge software to determine the RMS during the middle second of holding each dumbell
  • Create a graph of RMS EMG versus elbow angle
  • Turn in the graph and a write up discussing the graph and why it might be linear or not