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The data collected by the software Tracker we use them on software Vidle
On the code replace ball.pos with the initial position
ball.vel with the initial velocity
Δt with delta t
Now calculate the velocity with the form u = (xf - xi)/Δt
on the loop while t smaller the final time from Tracker
Afterwords Run and Run Module
The new data aside from the fact that appear on the screen
is recorded on the file pythonTest.csv
Right click in the file pythonTest.csv open with OpenOffice.org Calc
and click “Διαχωριζόμενα με κόμμα”, click “προεπιλογή” and choose “Αγγλικά”
Import data from Tracker
Select data and right click on diagram,
on the wizard select “ΧΥ Διασπορά”, “Σημεία και γραμμές”
next, next End
The difference between the two graphs is explained as follows:
In the model have fnet zero and therefore a constant speed,
while actually the speed does not remain constant because fnet not zero.
fnet is the resultant of several forces including the force of gravity,
buoyancy and the friction with the walls of the container.