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Analyzing the motion of a plastic bottle down an elevated ramp

  1. Sep 2, 2011 #1
    Hi All

    I am doing an experiment where I am analyzing how the volume of water in a plastic bottle affects the time taken for it to roll down an elevated ramp and particular distance along a horizontal plane. I need rigorous theory for this experiment which includes moment of inertia, fluid dynamics and angular momentum. I need to know how VOLUME affects TIME. Very specific. Give me lots of theory.
  2. jcsd
  3. Sep 3, 2011 #2


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    welcome to pf!

    hi coolness! welcome to pf! :wink:

    in this forum, we expect you to do most of the work, and then we comment and help :smile:

    but first, tell us from your observations what the water actually does

    does it stay completely level, does it slosh backwards and forwards a little, does it "loop the loop", or something in between, and does its behaviour change as the speed (or the slope) increases? :wink:
    is there any other sort of ramp? :confused:

    or do you mean a ramp in an elevator? :rolleyes:
  4. Sep 3, 2011 #3


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    Fluid dynamics -> forget theory, just try it!

    But seriously, this is way to complex to treat with a theoretical analysis on paper, unless you assume no friction between the water and bottle, so the water stays level and doesn't start to rotate.
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