Questions tagged [newtonian-gravity]
This tag is for questions regarding the Newtonian model of gravity in which the force between two objects is given by $~GMm/r^2~.$ It is a natural phenomenon by which all things with mass or energy – including planets, stars, galaxies, and even light – attract one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
5,047
questions
0
votes
3
answers
321
views
Infinite acceleration of bob in pendulum with no friction or air resistance
So i'm a bit confused about something. If we take a mathematical pendulum and we apply a force to it. We ignore all friction and air resistance and only consider gravity and the force applied to bob. ...
CommunityBot
- 1
0
votes
0
answers
31
views
Better equations for modeling and simulating a halo orbit?
I'm trying to model a halo orbit at low altitude (10m from surface). The satellite is using propulsion to trace the circular halo path. It looks like this "from the top" (the blue ball is ...
- 231
0
votes
0
answers
31
views
Restricted 3-body: one large mass and two smaller ones
A restricted 3-body problem is usually understood as two large bodies and one much smaller one that doesn't affect the motion of the other two.
I am curious about a 3-body problem with one large body, ...
- 207k
0
votes
1
answer
75
views
When two objects collide, which directions do they go in after the collision?
I am watching this video here:
https://www.youtube.com/watch?v=KPhMMnIocR0&list=PL4VRaRxeNj-1F-JukcRVAzbiIi0ibrHqy.
At 11:02, the author shows a simulation and says that for a Galton Board (https:...
- 12.1k
17
votes
5
answers
2k
views
Does 'special relativity + newtonian gravity' predict gravitational bending of light?
It seems to me that special relativity (SR) already predicts that gravity will bend light rather than this effect being a proof of general relativity (GR). Photons have energy proportional to their ...
- 450
6
votes
7
answers
1k
views
What changes the velocity perpendicular to radius in an elliptical orbit?
I'm working currently on a problem that asks to justify that angular momentum and kinetic energy conserves for a planet in an elliptical orbit. Although I've been taught that angular momentum should ...
- 10.6k
0
votes
2
answers
277
views
Newton's 3rd law and normal force
There is something I hope you can help me understand...
According to my physics course, when I stand on the surface of earth, the normal force prevents me from "falling down" because it's ...
CommunityBot
- 1
7
votes
2
answers
2k
views
How are the Lagrange points determined?
According to Hyper Physics, there are 5 equilibrium, or Lagrange points of the Earth-Moon system and only 2 of them are said to represent stable equilibrium points.
This made me think if there is an ...
- 207k
1
vote
1
answer
48
views
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 ...
- 207k
0
votes
1
answer
57
views
When is it appropriate to say Newtonian gravity is a force? When is it not appropiate? [closed]
Please help me understand the notion of force when it is applied to Newtonian gravity. From my understanding forces in physics involve interactions with at least 2 objects and can cause an ...
- 207k
1
vote
1
answer
336
views
Effect of wheel location on center of gravity
So, my kids are in Cub Scouts and are racing in the Pinewood Derby for the first time. After a thorough read-through of the rules, there is nothing prohibiting a racer from shifting the rear axle (or ...
CommunityBot
- 1
0
votes
1
answer
252
views
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 ...
CommunityBot
- 1
3
votes
1
answer
112
views
Confusions on The Gravitational Energy of a Point P in a Cube
I have been working, quite tirelessly, to try and find an answer to a question that has been bothering me for some time now.
I have been working over some proofs, in the Newtonian Mechanics world, to ...
- 24.2k
7
votes
2
answers
1k
views
Boundary conditions in Poisson's equation for gravity
Say we want to calculate the gravitational potential everywhere around(outside) a solid, circular, right cylinder.
We want to use Poisson's equation for gravity for that (Laplace(U) = -4*pi*density ...
CommunityBot
- 1
-5
votes
1
answer
66
views
Can the $r^2$ in gravity be seen as signifying the distance of object 1 to 2 times distance from object 2 to 1 [closed]
If the formula for gravity multiplies the mass in the numerator and the distance in the denominator is this akin to saying the multiplied masses over the multiplied distances times the gravitational ...
- 743