All Questions
Tagged with orbital-motion forces
63
questions
1
vote
2
answers
67
views
How do two things attracted to each other move in mechanics?
Okay very simply:
If you have two objects in 1D and they're both attracted to each other by some force (say there's a spring pulling them both towards each other, or Coulomb's Law or something)...
How ...
0
votes
1
answer
34
views
Space-for-time Derivative Substitution in Solving for Elliptical Orbit
I am currently working on a simulation of the Newton's Cannonball thought experiment, in which a stone is launched horizontally from atop a tall mountain at a high speed (in the absence of air) and ...
0
votes
1
answer
95
views
Applying 1 gram-force for 1000 seconds to 1kg mass
I am looking into ion thrusters and the small amount of propulsion they provide.
I am really new to this, so I want to understand. If we have mass of 1 kg in space and we are able to apply to it a 1 ...
1
vote
1
answer
109
views
Projectile of an object thrown from rotating planet
Last night I couldn't sleep for some time because of thinking this problem. The starting point of this problem was actually "If we were to jump perfectly vertically on earth, would we land on the ...
0
votes
0
answers
14
views
Reading on weighing scales at the equator of a moon in a tidally locked two-body system
I'm trying a made-up extension of this problem. Consider the planet Mars and its moon Deimos, which can be approximated as meeting the following simplifying conditions:
Both objects are perfect ...
- 208
0
votes
2
answers
155
views
Counteracting gravity in vertical circular motion
When you have a mass moving on a rope in a vertical circular motion, at the top and the bottom of the swing, the force of tension cleanly takes care of gravity and creates a centripetal force. However,...
- 39
0
votes
0
answers
228
views
How to find the distance between two stars in a binary star system with given orbital period and velocity?
If we know the orbital period, and the velocity of both stars
Should I use Kepler's third law ?
$$T^2 = 4\pi^2r^3/(G \cdot M)$$ where $T$ is the orbital period, $M$ the mass of the star, $G$ the ...
- 155
1
vote
2
answers
616
views
General solution for the two-body problem [closed]
I am trying to compare numerical solutions of the two-body problem with the analytical one. But, for some reason, the analytical one doesn't seem to agree with the numerical one. For the numerical ...
- 11
0
votes
2
answers
107
views
Amount of Force to De-orbit a Satellite [closed]
Assume I have a Low Earth Orbit (LEO) satellite of mass $m$ and velocity $v$ that I would like to de-orbit, assuming I have a propulsion unit, how much force do I need to make it de-orbit, and how can ...
8
votes
3
answers
988
views
Can Kepler's laws be used to derive Newton's gravitation formula?
I know that Newton's universal law of gravitation can be used, along with his laws of motion, to derive Kepler's laws. But what about the other way around? Can Kepler's laws be used to derive Newton's ...
- 1,252
0
votes
3
answers
95
views
What is the extra kicks to accelerate a spacecraft during gravity assist?
Suppose a spacecraft coming from behind a planet during a flyby, it gets a boost in speed and also change in direction of travel but where does this extra kicks come from? Now that I understand ...
- 13k
0
votes
1
answer
129
views
What (pedantically) defines a "central force", as in "central force law of areas", etc.?
A typical description of a central force is found here Lecture L15 - Central Force Motion: Kepler’s Laws (pdf).
"When the only force acting on a particle is always directed to wards a fixed ...
- 2,015
1
vote
4
answers
529
views
Where does the force tangential to Moon's orbit come from?
Not sure if I'm correct, but as far as I know, while moon is revolving around, it is unable to reach the Earth because the Earth's gravitational force isn't strong enough for that. This presumes that ...
- 47
0
votes
1
answer
134
views
The Force of Gravitational Waves
How could one calculate and derive the "force" or displacement and stretching of an object due to gravitational waves?
0
votes
4
answers
296
views
Why can’t I use $F=ma$ to calculate the orbital path of a planet? [closed]
Why doesn’t gravitational acceleration over time predict the planet's distance from the Sun? Gravity is toward one point and over time you should be able to predict the distance.
If the planet is ...
- 71