velocity not smooth in tracker 4.85 dynamic model for free fall with air drag

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Jumps in velocity in tracker 4.85 dynamic modle for free fall.

Ami B
9 Posts

Hi, to the Tracker experts , as high school physics teacher I use Tracker a lot I am trying to study "free fall with air drag" using "Tracker (Window 4.85) " capturing video with mobile camera (30fps). I have some difficulty with the model the velocity is not smooth.

I am using dynamic model with several masses of the same shape attached are the model and graph for 5 gram and 20.3 gram: M (Kg) V (m/s) kl kt Reynolds 0.005 2.10925 0.023231 0 0 0.0203 3.794713 0.034049 0.004843 0.539689

remarks I did excel model using Euler method and got smooth curve. (this is the simplest)

also I suggest to estimate the error by cheking the differnce of the model and the real X,Y values and Velocity .

also may be using more points for the model will help ( half or third of the time)?