# Calculating velocity from acceleration

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• Dec 8th 2008, 09:15 AM
dr_wombat
Calculating velocity from acceleration
Hi everyone.

I'm working with a 1 dimensional accelerometer which records body movements and I'm outputting the information into a graph in Excel.

But now I am trying to figure out velocity from this information and I'm having real trouble coming up with an equation that will translate variable acceleration into velocity in my spreadsheet.

Any help would be greatly appreciated.

Thanks.
• Dec 8th 2008, 09:28 AM
vincisonfire
It depends if you "know" things like : is it uniformly accelerated? etc.
In general, you would plot acceleration vs. time.
Then fit a polynomial to your data set.
Compute the integral to know the area under the curve.
To find the constant, you have to know initial velocity.
• Dec 8th 2008, 09:34 AM
dr_wombat
Quote:

Originally Posted by vincisonfire
It depends if you "know" things like : is it uniformly accelerated? etc.
In general, you would plot acceleration vs. time.
Then fit a polynomial to your data set.
Compute the integral to know the area under the curve.
To find the constant, you have to know initial velocity.

Acceleration is not uniform, it is variable and the initial velocity is 0 as the motion I am tracking is a single jump on the spot, starting and finishing at rest.
• Dec 8th 2008, 09:38 AM
vincisonfire
Then you must do as I told you, that is you would plot acceleration vs. time.
You want to know the area under the curve.
The best way should be to fit a polynomial to your data set.
Compute the integral to know the area under the curve.