# physics

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What equation should I used for a water bottle rocket lab?

I am using distance vs volume of water. Of course, the volume of water is my independent variable. What equation should I use for this lab?

• physics -

According to a Wiki article, the formula for the instantaneous thrust is
F=2PAt
where
F=thrust
P=pressure
At=area of the nozzle

Obviously the mass changes with time as well as the pressure. So both F, mass and P are functions of time, and you will need to integrate the resulting acceleration over time to get the distance.

Do read through the safety precautions before attempting this lab.

Ref:
http://en.wikipedia.org/wiki/Water_rocket

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