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Author: luke tan video, model lookang
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Newton's Third Law - Water Rocket Experiment by ETDtogo

Model

fy = -9.81+if (t<0.5,T,0)

where T is 23.4 N.
what the model suggests is the thrust is 23.4 acting for 0.5 seconds at beginning of the video.

assumption

mass is constant
thrust is constant at 23.4N

the flight path is roughly close the real motion.

of course, the model is flawed, but that is the nature of science, a better model gets made by building on other people's idea.

can you build a better model?

Reference:

Kinematics missing resources in OPAL now completed!

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Details: Parent Category: 02 Newtonian Mechanics; Category: 02 Dynamics; Published: 09 September 2015; Created: 09 September 2015; Last Updated: 07 February 2019; Hits: 3548