Thursday, August 25, 2016

Ping Pong Ball Rebounce Model

Ping Pong Ball Rebounce Model
video Ning HT
model Wee LK.
http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/02-dynamics/424-pingpingballning


Ping Pong Ball Rebounce Model
Model building Process

  1. Select Dynamic Model Cartesian, propose inital model say Fy = -mg
  2. add parameter g = 9.81 since assume m =1 by default
  3. determine vy when t=0, which is found via analysis to be vy = -0.6
  4. Fy = -mg-kvy where kvy is drag force
  5. fine tune value of k until match data k is found to be k = 1.11
  6. this completes the fall under drag model  
  7. to add the rebounce force
  8. propose computational thinking, if (t< thitground , true, false )
  9. nestted if statements to achieve answer
  10. can you get the same model?, need to assume contact time of 0.02
  11. the model suggests contact force is 500 N for a mass of ping pong m=1kg 
  12. if ping pong mass is measured, just key in to find the contact force.
  13. enjoy!