All Questions
5
questions
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 ...
5
votes
4
answers
245
views
How does Newtonian Gravity explain the difference between the experience of 1G and zero gravity? Or can it?
Humans can feel the difference between
being on earth's ground, and
being in space (zero gravity)
This can be explained by general relativity, where in (1), force is applied by the ground upwards, ...
- 161
0
votes
1
answer
249
views
Motion of bodies released form rest in a freely falling cabin
In a paper I was solving, there was a question stated as such:
A narrow but tall cabin is falling freely near the Earth's surface. Inside the cabin, two small stones A and B are released from rest(...
- 113
1
vote
1
answer
110
views
Finding the frame of reference in which Newton's law of gravitation applies
I've always wondered, in which frame of reference does Newton's law
$$
\boldsymbol{g} = -\frac{GM}{r^2} \widehat{\boldsymbol{r}}
$$
actually apply? In general it can't be the one in which the the ...
- 211
1
vote
2
answers
2k
views
Is the center of mass in general relativity equal to the center of mass in newtonian gravity?
Consider 2 point masses $A,B$ a distance $d$ away from each other without velocity or rotation spin. Is the center of mass in general relativity equal to the center of mass in newtonian gravity?
In ...
- 926