All Questions
Tagged with water newtonian-mechanics
45
questions
10
votes
2
answers
487
views
Could a fish swim out of a sphere of water in a zero-gravity environment?
Can a fish swim out of a sphere of water in a zero-gravity environment?
I am going to state some assumptions.
We assume the sphere of water is not affected by any thermal properties of its zero-...
- 343
13
votes
9
answers
5k
views
Why does the opposing force differ in when falling on concrete vs on water in spite of Newton's third law?
If a person jumps from the first floor of a building and lands on a concrete surface, they will suffer serious injury because of Newton's third law.
If the same person jumps the same distance and ...
- 165
1
vote
6
answers
997
views
What is physically going on when I stick my finger in a glass of water and the scale tips downards implying it got heavier?
Suppose I have a scale with a glass of water on one side and a counterweight on the other side. If I stick my finger in the glass of water I observe that the water side of the scale becomes heavier ...
- 73
1
vote
3
answers
2k
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A balloon under the ocean
So everybody is familiar with how buoyancy works in theory. However, if I sink a balloon filled with air underwater, the pressure of the water will compress the air inside it, reducing the volume of ...
2
votes
2
answers
96
views
How do two water droplets collide in the space?
Suppose two balls coming towards each other with the same speed, collide head on, in the space (to neglect other external forces). After collision they will move along opposite directions.
Then ...
- 2,578
2
votes
2
answers
1k
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When putting a floating object in water, why the displacement of mass of water is not equal to only the part of the object inside the water?
In this question Will a bathtub full of water weigh more if I add something that floats in the water? the marked answers mentioned a special case where the bathtub is full to a brim and the boat is ...
- 493
2
votes
1
answer
326
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Is there any formula to calculate the impact when falling onto water surface from speed?
So I know how to do the math of instantaneous speed when doing free fall:
$$v = g \cdot t $$
and here comes into my question: how can I calculate the impact on water surface when hitting it at a ...
- 21
1
vote
2
answers
38
views
Difference in the equlibrium of the buckets [closed]
Let there be a bucket of mass on earth resting on floor with water reaching the brim. And now consider another identical bucket with water till brim in outer space with no gravitational influence, and ...
10
votes
7
answers
7k
views
We know a human cannot run on water, but could a much stronger and faster animal?
We know a human cannot run on water, but could a much stronger and faster animal?
This viral video shows a moose running across a body of water:
https://www.youtube.com/watch?v=K5-0d00hV1c
Some say ...
- 548
0
votes
3
answers
124
views
Can you explain the meaning of buoyancy, written here?
I got this Archimedes' principles from a website named smithplanets.com
Can you explain why we cut the volume of water equivalent to the weight of an object when the object is floating in the water ...
- 335
1
vote
4
answers
231
views
How do buoyancy and pseudo forces combine?
About the diagram:
A tennis ball is attached to a string which is attached to the jar.
The string is mass less.
The density of the ball is less than that of water.
The F.B.D of the tennis ball:
Thus ...
- 335
1
vote
1
answer
138
views
Why does water spread when thrown?
I have noticed that when you throw a bucket of water (or any other liquid), it spreads out. Why does it not stay clumped together like a ball or the shape of the container it was thrown from?
- 115
1
vote
0
answers
125
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Ball motion in water
I am analyzing a video of a ball falling in water with tracker.
The ball falls in a free fall for few seconds before it reaches a glass of water. The ball goes down till 3/4 of the glass, then stops ...
- 11
1
vote
2
answers
2k
views
Why does water flow downhill?
Researching this topic, I found everyone just saying because of gravity. But that makes no sense to me. Gravity exerts a downward force:
But water flowing downhill goes sideways. There must be a ...
- 13
1
vote
1
answer
748
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Water stream impact force
Since I'm not a physics or math expert, I wanna ask how to calculate the actual force of water launched from a water cannon, and then for example compare it to the forces from a firehose. I know that ...
