All Questions
Tagged with newtonian-gravity reference-frames
19
questions with no upvoted or accepted answers
3
votes
1
answer
95
views
Can a pendulum at resting equilibrium position still demonstrate the Earth's rotation?
I conducted an experiment in my youth, creating a 'sand pendulum' hanging from the bedroom ceiling to a bowl of flour. I did not set the pendulum into motion, but rather wanted to see if the force of ...
- 31
1
vote
0
answers
60
views
Free fall of two point particles in general relativity vs. Newtonian mechanics
In general relativity (GR) the equation of free fall of two point particles which start from rest at some finite distance $r_i$ is strikingly similar to the equation of free fall in Newtonian ...
1
vote
0
answers
90
views
Reference Frame conceptual confusion
I am getting confused as to why a ball still feels gravity when inside a moving car. The point of a reference frame is to reinterpret all the forces acting on a particle in one frame only. Hence all ...
1
vote
0
answers
191
views
Restricted 3-body problem - Rotating coordinate system
I'm trying to follow the formulation of the restricted 3-body problem in Taff's "Celestial Mechanics" book as I'm writing an essay on Lagrange points and am confused by the transformation into the ...
- 13
1
vote
2
answers
106
views
Reference frame, gravitation and kinetic energy
English is not my primary language. I apologize (and would like corrections) if the terms I use are not the right ones.
In a geocentric reference frame, the moon rotates around the Earth. So its ...
- 111
0
votes
0
answers
79
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
76
views
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
1
answer
94
views
Experiment to find the Center of Gravity under non-uniform $g$-field
When asked about how to find the center of gravity (CG) for a system, the answer normally goes like "suspend the system at different points and see how the vertical lines pass through. The CG is ...
0
votes
0
answers
118
views
Applied Example of Coriolis Force/ Effect for an Object Moving around Earth
There are very few examples on the Internet about how to calculate the Coriolis Force of an object moving around Earth.
Could you give me your feedback about how I proceeded ?
The Coriolis Force is ...
- 155
0
votes
0
answers
58
views
Separate the rotational acceleration from the gravity
I tried to plot the magnetometer and accelerometer readings: Fig1 and Fig2, respectively. The readings were collected by rotating the sensors around x,y,z axes. As you can see, the mag readings (Fig1) ...
0
votes
2
answers
62
views
Can the apparent weight in a elevator accelerating downwards be compared to that of body submerged in a fluid
Can the apparent weight of a person ( here I mean what a weighing scale would read if that person were to stand on it ) in a elevator going downwards( NOTE: the acceleration is less than the ...
- 801
0
votes
1
answer
149
views
Some concepts of circular motion between man and the Earth？
I know it's a regular question, but I'm having a problem with the concept of circular motion.
Intuitively, the earth and people have the same angular velocity，It's because people are standing on the ...
- 35
0
votes
0
answers
75
views
Weight at Poles and Equator Wrong?
Recently, I was thinking about the acceleration due to gravity on Earth when I remembered that I was taught that you weigh less at the equator because a fictitious centrifugal force "throws" you off ...
- 101
0
votes
0
answers
22
views
Are the high tides always more unequal when the centre of gravity is within a planet?
In case of our high tides at both sides of the Earth it seems that they are almost equal. But is there a slight difference because the center of gravity is about 1,700 km below the surface of the ...
- 3,348
0
votes
1
answer
252
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Will the water stay in a falling glass?
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 ...
