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Results tagged with newtonian-gravity
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user 75518
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.
30
votes
Accepted
What would be the rate of acceleration from gravity in a hollow sphere?
If the mass/charge is symmetrically distributed on your sphere, there is no force acting on you, anywhere within the sphere. This is because every force originating from some part of the sphere will b …
- 3,129
1
vote
Gravitational force of a ring
$$ \vec{F} = - G m \int \frac{\varrho(\vec{r}\ ') \cdot (\vec{r} - \vec{r}\ ')}{|\vec{r} - \vec{r}\ '|^3} d^3r'$$
where $\varrho$ is the mass distribution. The Integral is taken over the whole volume …
- 3,129
0
votes
Accepted
Calculating the first cosmic velocity / velocity for a circular orbit
Writing it the way you did, you don't try to compensate the force, but to set it equal.
This means you account for the fact that the centripetal force is gravity and nothing more and they do point in …
- 3,129
1
vote
How do these factors affect the free fall of objects?
If only the forces of gravity are present, all objects fall at the same rate. This is what one calls equivalence principle. In classical mechanics it shows up in the force law for two particles of gra …
- 3,129