Physics 141, Fall 2016.

Department of Physics and Astronomy | University of Rochester
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Laboratory 5, Collisions.

In this analysis we will study the correlation between loss of kinetic energy and deformation of soda cans. To analysis the video we will use LoggerPro (which you have used previously for various homework assignments):

  • Start LoggerPro.
  • From the “Insert” menu, select “Movie” to open the movie you want to analyze.
  • At the bottom right-hand side of the video window you see a button with red dots with allows you to “Enable/Disable Video Analysis”.  Enable video analysis a set of tools will appear on the right-hand side of the video window.
  • Select the ruler button to set the scale.  Use the rulers on the left-hand side of the video to calibrate your screen.  After selecting the ruler button you move your mouse to the rear wheel of the left cart in the video, click-and-hold your mouse button, move your mouse horizontally to below the light that is mounted on the cart, and release the mouse button.  A window will emerge, asking you for the length of the “calibration line” you just drew on the screen. This distance should be 76.6 cm.
  • Use the “red-green dot button” to select "Point Sries: X:Y” and use the mouse to the position of one of the two cart in your collision video.  Each time you select a position in a frame, the video will advance to the next frame.
  • At the end of the video, rewind it, use the “red-green dot button” to add another “point series”, specifying the position of the other cart.
  • After completing your data entry you will see that the x and y positions and velocities for all frames and for both data series are listed in the data table.  These data can be exported by selecting “Export as …. Text” from the file menu.  The file created can be imported into Excel or IGor and you can use Excelor IGor to determine the velocities.
  • You can also do the entire analysis within Logger Pro. Click here to see a demonstration of the capabilities of Logger Pro.
  • Or, even better, you can do the analysis with IGor Pro. Click here to see a demonstration of the capabilities of IGor Pro.

Details about the collisions can be found by looking at the following pages:

Links to the collision videos can also be found here.

Last updated on Thursday, November 19, 2015 8:58

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