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{source}
<?php
require_once JPATH_SITE.'/TTcustom/TT_contentparser.php';
//include 'TT_contentparser.php';

//Take note that the model folder has to be within a trz folder. E.g.  /02_newtonianmechanics_2kinematics/trz/airpuckconstantvelocity

\(parameters = array( "topicname" => "02_newtonianmechanics_3dynamics", //e.g. 02_newtonianmechanics_2kinematics
"modelname" => "pingpingballning"); //e.g. airpuckconstantvelocity

echo generateSimHTML(\)parameters, "TRZ");
?>
{/source}

 

Version

http://weelookang.blogspot.sg/2016/08/ping-pong-ball-rebounce-model.html

 

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 {source}
<iframe width="420" height="315" src="https://www.youtube.com/embed/P7RwKWfBzkw" frameborder="0" allowfullscreen></iframe>
{/source}
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 {source}
<iframe width="420" height="315" src="https://www.youtube.com/embed/jdTKq1CLRCg" frameborder="0" allowfullscreen></iframe>
{/source}
if ping pong mass is measured, just key in to find the contact force.
enjoy!

 end faq

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