http://weelookang.blogspot.sg/2011/05/workshop-on-learning-physics-of-sport.html

 

Lee T.L., Wee, L. K. (2011, 19 January) workshop on investigation of the kinematics of a falling ball through Video Analysis and Modeling , 3rd Instructional Program Support Group (IPSG) Physics, Anglo-Chinese Junior College, Singapore

 
Workshop on investigate the kinematics of a falling ball Learning Physics of Sport Science through Video Analysis and Modeling, Anglo-Chinese Junior College, Singapore by Lee T.L., Wee, L. K. (2011, 19 January)

recently Tat Leong email the worksheet
https://docs.google.com/document/pub?id=1Qj4XBLEDT4jd-BH9KI80Fk4A-DVz46NGzzFG0SGOGF0
video can be doanloaded here http://www3.science.tamu.edu/cmse/videoanalysis/balldropbounce4x.avi
http://www3.science.tamu.edu/cmse/videoanalysis/  by Joel A. Bryan

 


not sure why the embed code result in a small window


Workshop to investigate the kinematics of a falling ball , Anglo-Chinese Junior College, Singapore by Lee T.L., Wee, L. K. (2011, 19 January)

Workshop on Learning Physics of Sport Science through Video Analysis and Modeling, Anglo-Chinese Junior College, Singapore by Lee T.L., Wee, L. K. (2011, 19 January)

recently Tat Leong email the worksheet
https://docs.google.com/document/pub?id=1Qj4XBLEDT4jd-BH9KI80Fk4A-DVz46NGzzFG0SGOGF0

Aim:    To investigate the kinematics of a falling ball
Apparatus:    Computer Lab with
Tracker is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
    Software:    Java 1.5   jre-6u20-windows-i586.exe
Contact:    Lee Tat Leong (This email address is being protected from spambots. You need JavaScript enabled to view it.), Wee Loo Kang (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Background:

Concepts in mechanics which include speed, velocity, acceleration, force, gravitational field and energy conversion and conservation are explored in this lesson. Analysis of the motion of an object is performed using free-body and vector diagrams, graphical analysis as well as Mathematical formulas.

Procedure:
  1. Launch the software tracker by double clicking on the tracker.jar file.
  2. Click the Open button 
  3. Select the display of the clip settings by clicking the clip settings button at the bottom right end of the player as shown. 
In the clip settings dialog, set the Start and End frames to define the range you wish to analyze. In this video, set start frame to be 2 while the end as default. Click on OKto proceed.
  1. Set the reference frame origin and angle. Click the Axes button .
  2. To calibrate the scale on the video, click the Tape Measure button 

  1. Click the Create button Point Mass.  

  1. The ball maybe difficult to detect due to the quality of the frames, select the Video–Filters-Deinterlace-Even and close it after selection. This step may increase the visibility of the ball.
+ mouse click
  1. If tracking an object, mark its position on every frame by holding down the shift key and clicking the mouse (crosshair cursor) as the video automatically steps through the video clip. Note: don't skip frames--if you do, velocities and accelerations cannot be determined.  Track the ball until end of frame. Plot and analyze the tracks The Plot View displays graphs of track data. To plot multiple graphs, click the Plots button and select the desired (3) plots number. Click the x- or y-axis label to change the variable plotted on that axis. In this video, choose y versus t, vy versus t & ay versus t.
  2. Right-click on a plot (y versus t) to access display and analysis options in a popup menu. Select the various options as shown in the figure.

  1. Select points you want to perform a curve fit. For this exercise,
    • select “Parabola” Fit Equation of the form y = a*t^2 + b*t + c,
    • select “Autofit”,
    • take a look at the parameters and values
  2. Repeat Steps 9 to 11 for plot (vy versus t) and use the “Linear” Fit Equation y = a*t + b
  3. Right click on the plot of vy versus t and select Analyze-Area and select by click and drag the 2 grey vertical boundaries to select the area to measure for the duration of start of motion to the start of 1st bound of the ball. Calculate the area under a velocity-time graph.

Drag the grey lines

  1. Define potential energy, and total energy, via “data builder” (access through “Track Control”).
    * * *
Drag the grey lines

Define potential energy, and total energy, via “data builder” (access through “Track Control”).
* * *