Caculation of force exerted by water

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To calculate the force exerted by water on a leg while standing in a river, the drag equation can be applied, treating the leg as a cylinder. The user provided dimensions, including a leg area of 36 in² and water flow at 4 mph, but expressed confusion about the impact of time on force calculations. The discussion emphasizes that the force exerted by the water should remain consistent regardless of the duration of exposure, as long as the conditions remain unchanged. Resources like the drag equation and cylinder drag approximations were suggested for more accurate calculations. Understanding these principles will help determine the force exerted by the flowing water.
sadowski777
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Hi,

I was standing in a river and I'm curious how much force it was exerting on my leg. I'm not sure how to do this calculation. Here's what I know:

F=ma
if the final velocity is zero, F=mv/t

I'll assuming I was standing in 1ft of water, my leg is 36in^2, and the water is traveling at 4mph.

It doesn't make sense that the force exerted over 2 seconds would be different then the force exerted over 4 seconds.

Any suggestions or help?

Thanks
 
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Excellent. Thank you very much.
 

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