All Questions
18
questions
3
votes
2
answers
152
views
Is the magnetic Lorentz force $\vec{F} = q(\vec{v}\times\vec{B})$ a force of constraint?
I am currently studying the Lagrangian mechanics, and as far as I've understood, forces of constraint are the forces that are perpendicular to the surface of the movement of the object, thus do not ...
- 193
0
votes
2
answers
189
views
Is tension a reaction force or an restoring force?what is tension then?what are the differences in them?
Assume a rope of mass $M$ is connected to a fixed wall and is free from other end
Now,I pull on the end of the rope
My simple questions are:
1.What is the reaction force/Newton's 3rd law pair force ...
- 161
0
votes
2
answers
170
views
Confusion regarding the origin of Normal reaction
While reading about the normal reaction for different scenarios, I faced minor confusion regarding their origin.
Suppose a mass is kept on a surface. The mass exerts a downward force indirectly due to ...
- 1,771
1
vote
0
answers
47
views
Unstable Equilibrium of hinged rods
I conjured up a scenario where there are two rods free to rotate about a hinge connected by their ends by spring of spring constant $k$,both their masses are $m$ and length $l$ and mass is uniformly ...
1
vote
1
answer
200
views
Generalised Lorentz force expression from Classical Mechanics by Goldstein
I am reading chapter 7 in the 3rd edition of Goldstein's Classical mechanics textbook and the expression for the Lorentz force is confusing me. I cannot scan it so I am just going to write it out ...
0
votes
1
answer
156
views
Follow-up on "Derivation of Lagrangian of electromagnetic field from Lorentz force"
I have a follow-up on this post. The way I understand it, if one generally has a velocity-dependent potential $U(q, \dot q, t)$, then we can derive/define a generalized force $$Q_k = \frac{d}{dt}\frac{...
user248824
2
votes
2
answers
915
views
How is force transmitted across a body?
So I am leaning about various topics like physics like simple machines, center of mass, momentum, energy conservation, equilibrium but the more I study these "upper" level concepts the more ...
- 813
0
votes
1
answer
66
views
Physically, what does Force $×$ $d$(Current) measure?
Physically, what does $$\text{Force}\times d(\text{Current})$$ measure?
For example, if we have a boundary of a system and something flowing into the systems through the boundary. Then what is the ...
- 2,283
-1
votes
1
answer
220
views
Resultant effect of orthogonal motion of electric charges
*If two charges are moving uniformly with parallel velocity vectors that are not perpendicular to the line joining the charges, then the net mutual forces are equal and opposite but do not lie along ...
0
votes
2
answers
246
views
Why are six real numbers, $\vec E$ and $\vec B$, needed to paramaterize the electromagnetic force, even though force needs only three?
Since force is a vector, three components are enough to define it completely at some point in space and instant of time. Yet the electromagnetic force requires two independent forces, the electric and ...
- 3,108
2
votes
2
answers
7k
views
How can we compare the ratio of strenghts fundamental forces? [duplicate]
I have read in many books that the ratio of strengths of gravitational force, electromagnetic force, nuclear force is 1:10^36:10^38 (one: 10 raised to thirty six: 10 raised to thirty eight). On what ...
1
vote
1
answer
6k
views
Can Newton's 3rd Law be considered as a direct consequence of the coulomb's law of electric interactions? [closed]
Let me explain my thought. Lets consider Coulomb's definition of electric force between two charges as the fundamental law. Under this consideration, forces between charges already follow What Newton'...
- 121
0
votes
1
answer
703
views
Will dynamo generate electricity with reverse spin?
Will a dynamo generate electricity when it is spinning in opposite direction? If we alternate the rotation direction every minute, will it still generate electricity? How?
- 121
1
vote
2
answers
2k
views
Why can I put my hand through sand but not a table? [duplicate]
I've read in books that one can't put one's hand through a table because the table offers a "Normal Reaction" to the hand. And it is also stated that this force is electromagnetic in nature. But what ...
- 777
0
votes
2
answers
610
views
Electrical force between two objects
I tried to solve the following problem:
There are 2 objects . The object m1 with charge q and the object m2 with charge q.(same charge).The object m2 is connected with a rope to the ceiling.
at the ...
- 397