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Problems with air resistance

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I'm having a few problems implementing air resistance in a very simple simulation. Basically I have a bouncing object and I want to simulate the effects of air resistance in my program. Now there seem to be two difference ways to do this: there is Stoke's law which is for objects moving slowly through a liquid or gas or one for objects which cause a lot of turbulence. The first question is what is the cut off between the two? How do you work out which you need to use? For the moment I have just used Stokes Law (even if it is incorrect as it was simpler to implement as a test) which has given me the total frictional drag for that specific time period of the fall / rebound yet I am unclear how exactly to go about applying drag to my object as it falls. I'm sorry if this is a basic question but I'm just getting started with this stuff so be kind :).

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