NTNUJAVA Virtual Physics Laboratory
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Author Topic: Free Fall Cartesian with friction 2D Wolfgang Christian and Francisco Esquembre  (Read 5318 times)
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lookang
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on: November 27, 2008, 02:27:46 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE

Friction
The model assumes that energy is lost only during the floor collision. Modify the differential equation to include energy loss due to air friction. This energy loss can be modeled by including a friction (fluid drag) force Ffriction that is proportional to the velocity:
Ffriction = - b v .
Because drag is a vector force it will affect the ball's motion in both the x and y directions. Compare the effect of friction in this activity with the one-dimensional Free Fall activity.

How i implement the model is

1. add variable k
2. add variable mass
3. dvy/dt = -g - k/mass*vy
4. dvx/dt = - k/mass*vx


source code
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« Last Edit: August 03, 2009, 11:41:36 am by lookang » Logged
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