All Questions
9
questions
1
vote
2
answers
158
views
Why does the Lagrangian not show particle-interaction? Why are normal/tension forces not considered?
(1) For formulating a lagrangian for a system of particles compared to one free particle, we start with the kinetic energy and formulate a potential energy term that is in terms of each of the radius ...
- 17
1
vote
2
answers
625
views
How much time after will two oppositely charged particles collide for both gravitational force and electrostatic force?
Suppose two point objects charged with opposite charges $q_1$ and $q_2$ at a distance $r$ in a vaccum.
So, the net electrostatic force on both objects $= F_c = \frac {q_1q_2}{4π\epsilon_0r²}$ [$\...
- 1,070
2
votes
2
answers
2k
views
Why does Friction act Parallel to the Surface (Microscopic Level)?
If we assume an object (blue layer) sliding towards the right across a surface (black layer). According to Newton's 3rd Law, the frictional force would act to the left (resisting the object's relative ...
user226894
12
votes
2
answers
1k
views
Why is it that forces like gravity and electricity (approximately) basically act between pairs of bodies only?
In classical mechanics, with the limit of little movement (so no relativity, waves, and/or "magnetic" effects), we can see that gravitation and electricity can both be described as "two-body" forces, ...
- 20.6k
1
vote
0
answers
108
views
If gravitation force varied with $r^{-3}$ instead of $r^{-2}$ what would happen to Kepler's laws [duplicate]
2nd law wouldn't change as it is LCAM. 3rd Law would change. But I'm confused about first law. Does any body under influence of any central force move in an ellipse?Can anyone give a simple proof/...
- 109
10
votes
4
answers
953
views
The converse of Newton's shell theorem
The shell theorem states that a spherically symmetric body $S$ of mass $m$ has a gravitational field identical to that of a point particle $P$ of mass $m$ located at the center of $S$.
We can ask the ...
- 4,576
-1
votes
1
answer
60
views
If we apply force on sun, what happens to orbit of earth? [closed]
Earth is revolving around the sun. If we apply force on the sun and the sun moves away in any arbitrary direction, what happens to the orbit of earth? Will the earth also move along with sun with its ...
user130324
2
votes
1
answer
62
views
Computing the gravitational force on a planet in a particular system [closed]
I have a system of four planets moving in a 2D plane. I'm trying to write some code (C++) to find the positions of these planets at time t=3.
I'm probably going to attempt this via a leapfrog ...
- 123
1
vote
3
answers
2k
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Advantages/Disadvantages of "hanging off" a motorcycle when leaning
The closest question I could find with regards to this subject was this one:
Countersteering a motorcycle
However, it does not address the specific physics of what I would like to know.
There are 3 ...
- 111