# Physics

posted by Phyiscs

Sense I'm not taking Physics C but Physics B I guess I'm not expected to find the value of the drag force sense that would involve soem calculus. I just have a question though. If we performed a lab outside wouldn't the drag force vary from time to time sense the wind could increase or decrease???

1. drwls

Yes, strictly speaking. However, if you are doing a vertical drop test, winds will be mainly horizontal and will not have a large effect on the drag force in the vertical direction.

You can make pretty good estimates of drag from vertical drop tests, without using calculus.

2. to drwls

and how would I do that?

Can i find it without calculus in other situations?

3. bobpursley

For small velocities, you can model it as

DragForce=K*Area*v^2

where K is a constant, Area is the frontal area of the body, and v is velocity. This relationship is pretty good for small velocities, similar to those you would experience in a lab.

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