2D Kinematics Video Analysis
You may do this in self-selected groups of 2 or 3.
Go to the video analysis website (find it in the Schoology page with the videos of the car-on-track)
You will analyze the video of the launched basketball
If you can find a specific item to set the physical scale, use that. If not, assume the man is of average
height and use him.
Set X as a horizontal coordinate and Y as vertical. Put the origin wherever you want.
Click to measure X position and Y position vs. time. You should click every single frame and end up with
roughly 35 data points. Very roughly.
Start just after the ball has left the shooter’s hand (the 6th frame of the video) and just before it strikes
any surface
Use your two columns of position to calculate velocity. How do you calculate a velocity?
Velocity in X = change in or delta X / (change in or delta time)
You can subtract adjacent X positions and divide by the change in time from frame to frame
Write a short report. Include graphs of
X vs. Time
Y vs. Time
Vx vs. Time
Vy vs. Time
QUESTIONS TO ADDRESS
What do you find the horizontal acceleration (X) to be?
What do you find the vertical acceleration (Y) to be?
Generally speaking, does the path appear to be consisted with what we have learned should be true for
projectiles influenced only by gravity (acceleration 0 in X, constant and downward in Y) ?
Now go back and consider what happens to the ball while the man’s hand is pushing on it. In other
words, repeat the analysis above, but only for the first 5 frames. Does the ball appear to have constant
acceleration in either X or Y?
Each group should submit a single short report. Be sure all students’ names are on the report. No need
to make this as long as an official lab report. Just show me you understood what you did and can
address the questions above.
0
