All Questions
10
questions
0
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56
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Poincaré inverse square law unification
A while back, I came across a claim that was something like this: Poincaré said that no two fundamental force laws could have the same mathematical form such as $1/R^2$; that no two fundamental force ...
- 1
-3
votes
3
answers
113
views
How can the unit of Newtons measure both gravity and electromagnetism?
For context, I was thinking about forces. Force is the mass of the particle multiplied by the acceleration it undergoes. There are different kinds of forces, for example, gravity and electromagnetism. ...
- 161
0
votes
2
answers
179
views
A question about magnetic field lines
In the simple experiment of spraying iron filings around a magnet, why doesn't the magnetic field (provided that it is strong enough) cause the iron filings to form a $3\mathrm D$ skeleton along the ...
- 105
1
vote
0
answers
36
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Reason behind dependence of forces on the medium [duplicate]
I am a high school student and have covered basic concepts in electrostatics, magnetism and gravitation. It is clearly stated in my text book that the gravitational force experienced between two ...
- 2,342
2
votes
3
answers
426
views
A broader view on contact forces
I am aware that all the contact forces we experience like tension, friction, normal reaction, et cetera are complex manifestations of the fundamental forces which are gravitational forces, ...
- 1,147
16
votes
2
answers
8k
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Why does electric force depend on the medium?
Comparing the equations for the gravitational force
$$\vec{F}_g=-\frac{Gm_1m_2}{r^2}\ \hat{r}$$
and the electric force
$$\vec{F}_e=\frac{Kq_1q_2}{r^2}\ \hat{r}$$
I noticed that the only major ...
- 1,758
0
votes
3
answers
148
views
Traveling to Mars in 24 Days
I am trying to calculate an electromagnetic rail launch from the Moon but I need to know if humans can survive the launch. Please see the specs below.
150 miles of track
Proposed final launch speed ...
- 13
2
votes
1
answer
249
views
Falling through the ground [duplicate]
I do not know much about physics but I know that according to Newtons third law of motion when we walk we are pushing the ground down but the ground is pushing us up. What force is making the ground ...
- 21
4
votes
1
answer
3k
views
Gravity force strength in 1D, 2D, 3D and higher spatial dimensions
Let's say that we want to measure the gravity force in 1D, 2D, 3D and higher spatial dimensions.
Will we get the same force strength in the first 3 dimensions and then it will go up? How about if ...
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122
votes
10
answers
17k
views
How can I stand on the ground? EM or/and Pauli?
There is this famous example about the order difference between gravitational force and EM force. All the gravitational force of Earth is just countered by the electromagnetic force between the ...
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