Video Based Motion Analysis

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• Video Based Motion Analysis
• Tetyana Antimirova and Marina Milner-Bolotin,
• Department of Physics
• Faculty of Engineering, Architecture and Science
• Ryerson University
• OAPT Conference, May 22-24, 2008
• Ryerson University, Toronto

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WHAT IS VIDEO-BASED MOTION ANALYSYS?

• In Motion Video Analysis, experimental
  demonstrations or real-life events involving
  motion (roller-coaster rides, car race, sports
  events, objects falling, etc.) are recorded on
  videos and later analyzed using Logger Pro or
  VideoPoint software
• The position data are collected from each time
  frame
• Positions of objects in the video frame can be
  measured by pointing a mouse and clicking.
• The data generated can be graphed, analyzed in
  spreadsheets, compared to theoretical models.

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ADVANTAGES

• Demonstrates real event (as opposed to idealized
  textbook end-of-chapter questions)
• The data for problems/modeling come from the
  experiment
• A Video Analysis mini-project presents a feasible
  cost effective alternative to live experiments.
• Works whenever visible motion takes places

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Data Acquisition and Analysis Software from
Vernier (LoggerPro)

• 
  David Vernier
• www.vernier.com

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Motion Video-Based Analysis

• Motion Video-Based Analysis Resources
• LivePhoto Project
• http//livephoto.rit.edu/
• http//livephoto.rit.edu/wiki/
• Patrick Cooney website
• http//www.millersville.edu/pjcooney
• http//muweb.millersville.edu/pjcooney/mak
  ing-movies/

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TETYANAS FIRST TRY

• Tetyanas first attempt at motion video
  analysis at summer Activity-Based Physics Faculty
  Institute (ABPFI),
• Dickinson College,
• Carlisle, Pennsylvania, June 2007

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EXAMPLES
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Cart Going Forth and Back
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Cart Going Forth and Back
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Incline
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Free Fall
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VIDEO FROM CONTEMPORARY GALILEOS
PROJECTILE HOMEWORK(Courtesy of Activity Based
Physics Group)

• Frame-by-frame traced
  trajectory

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TWO-TRACKS DEMO FROM ONTARIO SCIENCE CENTRE

• Question Two
• metal balls are
• released from the
• the top point
• simultaneously.
• Which one will
• finish first?

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HOMEWORK

• Some of the traditional end-of-chapter problems
  can be converted into motion video analysis
  problems
• Additional benefit comparison of analytical
  solutions (whenever possible) with numerical
  solutions/modeling using real data

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MANY STUDENTS FAIL TO RECOGNISE THE SIMILARITIES
BETWEEN THESE SITUATIONS
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TRADITIONAL END-OF-CHAPTER PROBLEM

• A package is dropped from the plane which is
  flying with a constant horizontal velocity of
  Va150 ft/s. Determine the normal and tangential
  components of acceleration, and the radius of
  curvature of the path of motion just before the
  package strikes the ground R.C Hibbeler, (2006),
  Engineering Mechanics, Pearson

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PROBLEM EXAMPLE

• Based on what you know about curvilinear
  motion, calculate the rate of increase of speed
  for the third last point of the trajectory
  (t0.917). Whenever possible, use real data from
  the movie.
• (was offered as a supplement to the ABPs
  Galileos Projectile II Using Contemporary
  Techniques assignment)

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THE PROJECTILE PATH TRACED
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HORIZONTAL MOTION
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VERTICAL MOTION
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VIDEO-BASED MOYION ANALYSIS

• Potential to captivate and engage the students
• Potential to use whenever the visible motion
  takes place

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HANDS-ON PART

• Recoding our own video and inserting it into
  LoggerPro
• Analyzing movie using LoggerPro

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THANK YOU!