Anonymous at Thu, 4 Jul 2024 16:57:54 UTC No. 16267790

>>16267746
>water doesn't stick to or orbit around a spinning tennis ball because the ball isn't big enough.
it does, but locally, the earth gravity dominates, so everything crashes to the ground before you'd actually get to observe a water drop orbit a tennis ball at an incredible slow orbital velocity

there was a thread about this, in particular, it was explained with the analogy of an astronaut orbiting the space shuttle
https://warosu.org/sci/thread/16251939

Anonymous at Fri, 5 Jul 2024 07:15:15 UTC No. 16268630

>>16267746
bout tree fiddy

Anonymous at Fri, 5 Jul 2024 08:38:50 UTC No. 16268706

>>16267746
>What is the critical mass required in order to observe gravity?
1 planck mass

Anonymous at Fri, 5 Jul 2024 12:45:26 UTC No. 16268893

>>16267746
There is no limit to how small a mass can be to observe gravity, it's just easier to do so in bigger bodies like planets.
Here is a video by Steve Mould where he manages to measure the force of gravity using very little mass.
https://www.youtube.com/watch?v=70-_GBymrck

>Water doesn't stick to or orbit around a spinning tennis ball
If you where in the middle of space, you could make the water orbit the tennis ball, but it would do so very slowly. I may do the math later if I feel like it.

Anonymous at Fri, 5 Jul 2024 12:55:58 UTC No. 16268906

>>16267746
>>16268893

Let's say that the ball weighs 50 grams or 0.05kg and the distance between the centers of mass is 20cm or 0.2m

We must make sure that the acceleration towards the ball (gravity) is equal to the centrifugal force.

G = 6.673*10^-11
M=0.05
r=0.2
v is what we want to know

G*M/r^2 = v^2/r

From that we get that

v = sqrt(G*M/r)

Which is about 4*10^-6 m/s
That meas that to complete a full orbit, you would need 307666 seconds or 85.5 hours.

The force of gravity is there, but it's just too weak in comparison to earth's to notice it in our day to day lives.


I hope this was helpful in any way.