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Physics

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    $\begingroup$ Did you mean for your cup to be cylindrical and not tapered? Because reducing V would decrease A. $\endgroup$
    – DKNguyen
    Commented May 28, 2021 at 5:19
  • $\begingroup$ @DKNguyen Yes that or the angle of slope can be considered very small. $\endgroup$
    – FullBridge
    Commented May 28, 2021 at 6:08
  • $\begingroup$ Is the glass allowed to free with the water or will you hold it? In case you hold it, there won't be any F_g $\endgroup$
    – Sidarth
    Commented May 28, 2021 at 10:24
  • $\begingroup$ @Sidarth Why would there not be any $F_g$ if I hold it? $\endgroup$
    – FullBridge
    Commented May 28, 2021 at 10:40
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    $\begingroup$ I have to agree that pressure from the air is only on one side of the water. I started thinking of your water as solid ice, making it better to think about. In case the glass was a cylinder then as the ice block block falls, the vaccum suction in the top will prevent the ice from falling down. That is certainly true. $\endgroup$
    – Sidarth
    Commented May 28, 2021 at 10:53