Everyday experience tells me that a glass filled with water will fall and smash on the ground as a whole object as it started (water and glass together), given that it falls face up and it does not rotate, or flip while falling. Is my intuition right?
I know that in absence of friction all objects fall at the same rate, but I'm trying to analyze an everyday situation so air resistance must be taken in account!
Been knowing that there is friction exerted on the glass and on the water,
Will there be different outcomes if I use different types of glasses?
Let's say a plastic glass (Can I say that? I hope) and a ( glass) glass ahah.
I came up with some theories but they're long to eplain anyway I will post a link in the comment if somone has curiosity or time to read it!

  • $\begingroup$ Do you think I should edit the question? $\endgroup$ Sep 15, 2017 at 16:52
  • $\begingroup$ Wait I made a mistake not considering friciton! I neeed to add something I'll try to edit the question! $\endgroup$ Sep 15, 2017 at 16:56
  • $\begingroup$ Did you intend to neglect air resistance? $\endgroup$
    – JMLCarter
    Sep 15, 2017 at 17:04
  • $\begingroup$ Did you know that regardless of their mass, objects fall at the same speed? $\endgroup$
    – JMLCarter
    Sep 15, 2017 at 17:05
  • 1
    $\begingroup$ @A.C.A.C. I edited to make it more clear $\endgroup$ Sep 15, 2017 at 17:36

1 Answer 1


Depends if there is rotation and air turbulence against the water's surface.

If the glass falls straight down without rotation, and the water faces upwards, there is no force to push the water out.

If the glass rotates, you can have air that pushes the water out.

'Water getting out' means there are forces pushing against the water's surface away from the glass (to the side, to the top of the glass). Air cannot do that if you are falling straight down with the face pointing upwards. Unless you generate enough turbulence that a vortex pulls the water up and out of the glass.

  • $\begingroup$ The capilar force would push water out, but may not be enough to push out much or fight the air resistance. $\endgroup$
    – safesphere
    Sep 15, 2017 at 17:54

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