### About

### For Teachers

- Modelling Skydiving with Parachute Opening_parameterized1491.jpg

- Modelling Skydiving with Parachute Opening_parameterized0000.jpg

- ModellingSkydivingwithParachuteOpening_forLookang.docx

### 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/ |

### Credits

Author: Tan Kim Kia

Contact: This email address is being protected from spambots. You need JavaScript enabled to view it. | This email address is being protected from spambots. You need JavaScript enabled to view it.

### end faq

# Reference:

http://tankimkia.blogspot.sg/2015/10/modelling-skydiving-with-tracker.html?spref=fb

https://drive.google.com/folderview?id=0Bw72rpuy2MMLRUFtM1c1VzM2Rk0&usp=sharing#

# Modelling Skydiving with Tracker Software

# Model A(Red): Parachute opens slowly over T seconds

Fy = if(t<35,m*g-A_h*0.5*d*Cd*vy^2,if(t<55,m*g-0.5*d*Cd2*A_p*vy^2,if(vy>0,-m*g,0)))

# Model B(Blue): Parachute opens fully immediately T = 0

Fy = if(t<35,m*g-A_h*0.5*d*Cd*vy^2,if(t<35+T,m*g-0.5*d*Cd2*(A_h+(t-35)/T*A_p)*vy^2,if(t<55,m*g-0.5*d*Cd2*(A_h+A_p)*vy^2,if(vy>0,-m*g,0))))

Velocity-time graph for Model B:

# Conclusion

# Ideas for teaching and demonstration:

- Details
- Written by Kimkia
- Parent Category: 02 Newtonian Mechanics
- Category: 02 Dynamics
- Hits: 4473