All Questions
Tagged with newtonian-gravity reference-frames
228
questions
4
votes
4
answers
332
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What is the relationship between gravitation, centripetal and centrifugal force on the Earth?
I'm trying to analyze a situation wherein a ship is moving across the surface of the earth. I am trying to analyze this situation in a reference frame that is rotating with the earth (NED frame).
I am ...
- 311
0
votes
3
answers
75
views
Pseudo Orbital motion only due to Coriolis force
Planet, say of mass M and radius R is rotating with some angular velocity ω and a object of mass m (initially on the surface and rotating with the planet) was launched with velocity v vertically ...
- 19
1
vote
1
answer
47
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Drawing a free-body diagram for a body residing on Lagrange point $L_4$ and $L_5$
I am aware of the fact that Lagrange points $L_4$ and $L_5$ are stable equilibrium points however I cannot understand why they are equilibrium points in the first place.
Consider a Earth-Moon system ...
- 209
2
votes
3
answers
50
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Constant speed (at terminal velocity) and zero $g$
I have read the question What would a person experience in a free-falling elevator in a shaft long enough to reach terminal velocity? here and the answer was that you feel exactly the same if the ...
- 129
1
vote
2
answers
180
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Centrifugal force has always been a nightmare to me
Suppose I'm in a rotating space station (that is somewhere in free space) and there is no other force. Now how am I supposed to fall to the circumference of the station if nothing pulls me? I will ...
0
votes
3
answers
170
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Gravitational force and centre of mass
So question goes like
"What is the magnitude of gravitation force of the particle due to rod?"
In the figure the particle is of mass $m$ and from distance $d$ from end of the rod and the ...
0
votes
0
answers
78
views
Do all bodies in a 3-body system orbit their center of mass with respect to each of the other bodies?
Scenario
Consider an empty universe with just the Earth, Moon and the Sun. The Earth and the Sun will rotate about their center of mass, which is inside the Sun. The Earth and the Moon will orbit ...
0
votes
0
answers
35
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So I've found out heavier objects technically do fall faster? [duplicate]
Given the Earth's mass to be $M_E$, I know that $F_G = -\frac{GM_Em}{d^2}$, so the gravitation acceleration of a mass towards Earth is $g = -\frac{GM_E}{d^2}$. But what about the force exerted by the ...
1
vote
2
answers
1k
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Centripetal force on the surface of earth
Initially, I was looking for how centripetal force is produced on the surface of the rotating earth for a mass kept at any latitude. I went through the following threads -
Which force provides the ...
- 41
0
votes
0
answers
76
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Two-body problem and motion in a central field
If we consider motion of a body in a central (gravitational) field the equation of motion would be
$$-\frac{\gamma m_1 m_2}{r^2}\frac{\vec{r}}{r}=m_1 \vec{r}^{\prime\prime}$$
where the origin of ...
- 3
0
votes
2
answers
72
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How can people be weightless on space station?
I had read it somewhere that on the space station, people are weightless. even though artificial gravity is created there, people are still weightless. how can this be possible if there is gravity, ...
- 83
14
votes
9
answers
7k
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Is Earth really flattened at the poles because of centrifugal force?
My question is pretty much all in the title. I was always told that our planet is flattened at its poles due to the centrifugal force generated by its own rotation. However I don’t see how centrifugal ...
- 427
-1
votes
1
answer
78
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How does a gas giant planet hold it's spherical shape when it has tidally locked rotation in it's orbit around the Sun?
How does a gas giant planet hold its spherical shape when it has a tidally locked rotation in its orbit around its Sun? Wouldn't it fall apart without its gravitational pull from the rotation? How ...
0
votes
0
answers
34
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How can we use Newton's laws in an accelerating frame? [duplicate]
This question is bothering me for a while. As far as I know, newton's laws are valid for any inertial or non-accelerating frame. Then how can we apply newton's law on earth where we are constantly ...
- 48
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votes
1
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91
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Free falling elevator - A person would "levitate"? [duplicate]
If an elevator goes into free fall, assuming there's no friction or anything like that, would it actually float? From what I understand, this would only happen if the elevator falls with an ...
