For Teachers

- ping.wmv
- ping-frame2.gif
- ping-frame1.wmv
- ping-frame.wmv
- ping-frame.gif

Software Requirements


Android iOS Windows MacOS
with best with no no need Java
need Java
support full-screen? no no Yes Yes
cannot work on no mobile browser  understand Java....
no mobile browser  understand Java.... install Tracker from http://physlets.org/tracker/
install Tracker from http://physlets.org/tracker/



Author: Ning video, Loo Kang model
Contact: This email address is being protected from spambots. You need JavaScript enabled to view it.

end faq





Ping Pong Ball Rebounce Model
Model building Process

Select Dynamic Model Cartesian, propose inital model say Fy = -mg
add parameter g = 9.81 since assume m =1 by default
determine vy when t=0, which is found via analysis to be vy = -0.6
Fy = -mg-kvy where kvy is drag force
fine tune value of k until match data k is found to be k = 1.11
this completes the fall under drag model 
to add the rebounce force
propose computational thinking, if (t< thitground , true, false )
nestted if statements to achieve answer
can you get the same model?, need to assume contact time of 0.02
the model suggests contact force is 390 N for a mass of ping pong m=1kg 
if ping pong mass is measured, just key in to find the contact force.

 end faq

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Article ID: 420
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  • Dynamics
  • Junior College
  • Tracker
  • Windows/MacOSX/Linux including Laptops/Desktops
  • Science
  • Simulations