All Questions

Filter by
Sorted by
Tagged with
0
votes
1answer
35 views

Definition of non-conservative force [duplicate]

In defining conservative force, we say that "The potential energy difference is path independent." However, as far as I understand, potential energy only exists when there is a force field. ...
0
votes
0answers
41 views

Why definition of potential energy and law of conservation of mechanical energy is misleading several times?

I regularly see 1 or 2 questions on this website about the definition or application of potential energy.The users fundamentally ask the same thing in every question. What I have learned till now is:-...
0
votes
1answer
44 views

Is this understanding of potential energy correct?

I am studying basic mechanics and have reached the chapter on potential energy. However I am a bit confused about the difference between potential energy and the formula for the potential energy due ...
0
votes
5answers
242 views

Difference between voltage, electrical potential and potential difference

I am having hard time to visualize these two concepts in my mind seriously. First of this confusion came from two parallel plates that was connected to a power supply, charged then disconnected from ...
-2
votes
2answers
103 views

What is exact definition of potential energy if all forms of energy except kinetic comes under potential energy? [duplicate]

I need to know the exact meaning of potential energy. I AM confused what it actually means.They say all types of energy comes under 2 types kinetic and potential so what is potential energy then? My ...
3
votes
2answers
126 views

Can magnitude be negative?

My teacher told that magnitude is the positive value of that quantity or the modulus of that quantity. he also told that vector quantities have both magnitude and direction and scalar quantities have ...
4
votes
5answers
318 views

Could someone explain what is a potential?

In many part of physics, me talk about potential (electrical potential, gravitation potential, elastic potential...). All those definition looks very different, and I would like to know how all those ...
0
votes
2answers
56 views

Work Energy misunderstanding

Suppose I have to displace a body to a height $h$ and I applied force more than its weight. So, there will be an acceleration on the body. Then the body will reach the height $h$. Then I let the ...
3
votes
5answers
498 views

Why is voltage described as potential energy per charge?

Voltage is often called an electromotive force since it causes a flow of charge. However, it is described in terms of Joules per Coulomb or Potential Energy per Charge. Question: How does the ...
2
votes
2answers
116 views

What is a basic physics general definition of a 'potential'?

From the Wikipedia: In physics, a potential may refer to the scalar potential or to the vector potential. In either case, it is a field defined in space, from which many important physical ...
5
votes
1answer
148 views

Understanding conservative forces

I'm trying to better understand conservative forces. I have a decent intuitive idea of what they are, but I've recently learned the mathematical rigor behind it which has made me have some questions. ...
1
vote
3answers
88 views

Understanding the equation for Potential Energy

I am having a hard time understanding why Potential Energy can be calculated in the following way: $$ \Delta U = U_f - U_i = -\int_{x_i}^{x_f} F_x dx $$ In particular, I don't understand why there ...
13
votes
2answers
9k views

What is a potential?

I am self-studying electrodynamics and am wanting to know what is meant by a potential. I understand the concept of potential energy but what is meant by a potential? Is it the same thing as a field, ...
0
votes
2answers
49 views

What is the connection between the two definitions of voltage of potential difference?

When we were introduced to the concept of potential difference, we were given the example of water flow between two beakers through a pipe. Water flows through the pipe from a beaker which has higher ...
0
votes
1answer
404 views

Electric Potential of a “body”

We know that electrostatic potential is defined for a "point " in space but today when i was studying capacitance chapter i encountered phrases like "potential of earth" and "potenial of plate" and "...
0
votes
2answers
268 views

How has the definition of gravitational potential energy been derived?

The definition of gravitational potential energy is - The gravitational potential energy of an object at a point above the ground is defined as the work done is raising it from the ground to that ...
-2
votes
2answers
2k views

What is the difference between electric potential and electric potential energy? [duplicate]

I am really confused between electric potential and electric potential energy. Please help me in understanding the two terms and also show the differences between them.
0
votes
2answers
82 views

A More General Potential Energy

It occurred to me this morning that the notion of work and of spatial potential energy can be generalized to a more abstract form. In particular, work can be defined in terms of an abstract force ...
-2
votes
1answer
62 views

Clarification of the definition of potential at a point

My textbook defines the potential at a point to be equal to the work done in bringing a unit positive charge from infinity to that point, and then explains that the point contains another unit ...
1
vote
1answer
190 views

Possibility of defining “Path-dependent” potentials

Yes, I know the title seems stupid since the most important property of potential is that it's actually path independent. But I have a point. I just want to know is it possible to define a function ...
-1
votes
1answer
132 views

Is this a good description for potential energy?

The potential energy can be seen as the energy stored in a system that can be "expelled". An object at a height $h$ above its reference point has a potential energy given by $U_{gravitational} = mgh$. ...
5
votes
2answers
4k views

What is a potential well?

What exactly is a potential well physically? [I've read the linked Wiki article, but it doesn't answer my questions, such as, what does it mean for a particle to "move along a potential" and "roll ...
0
votes
1answer
98 views

Field independent definition of “Potential function”(Not Potential Energy)

I know what "Potential Energy" is: A function like $U(x)$ whose negative gradient is equal to the force $F(x)$ generating it: $$F(x)=-\nabla U(x).\tag{1}$$ But the definition of the "Potential ...
1
vote
1answer
117 views

Potential energy definition in terms of work done

It's true the source might not be the most reliable of all, however it states that: The potential energy $U$ is equal to the work you must do to move an object from the $U=0$ reference point to the ...
-1
votes
3answers
119 views

Does raising an object fastly gives more potential energy than if it were raised to the same height slowly? [closed]

If we raise an object fastly we apply more force so more work is done and eventually potential energy stored by object should be larger than that if it were raised slowly to the same height. But it ...
17
votes
4answers
26k views

Why is the potential energy equal to the negative integral of a force?

Why is the potential energy equals to the negative integral of a force? I am really confused with this negative sign. For example, why there is a negative sign in the gravitational potential energy ...
1
vote
2answers
867 views

What is the difference between the potential difference and potential energy of an electron?

What is the difference between the potential difference and potential energy of an electron? Let's take an example the potential difference (PD) across a resistor. if there's a current flowing, the ...
3
votes
3answers
37k views

What is the relation between ‘Electric Potential’ and ‘Electric Potential Energy’?

What is the relation between ‘Electric Potential’ and ‘Electric Potential Energy’?
5
votes
2answers
5k views

Susceptibilities and response functions

It is often confusing whether a susceptibility is the same as a response function, specially that often they are used interchangeably, in the context of statistical mechanics and thermodynamics. Very ...
1
vote
2answers
235 views

How this formula for work follows from the definition?

If a particle moves along a path $\gamma : I\subset \mathbb{R}\to \mathbb{R}^3$ then the work done by a force $\mathbf{F}$ is defined by $$W = \int_{\gamma} \mathbf{F} = \int_{I}\mathbf{F}(\gamma(t))\...
3
votes
3answers
2k views

Potential energy $= mgh$, what is $h$?

NOTE: when I say potential energy I mean gravitational PE The formula for potential energy is P.E = mgh. What is h referring to? Height, obviously. Consider the example: What is the potential ...
1
vote
2answers
306 views

Is electric potential a form of potential energy?

As I understand it, the concept of potential energy arises from analytical mechanics. Yet I often see the concept of electric potential $\phi$ introduced without mention of analytical mechanics. For ...
0
votes
2answers
113 views

Mathematical misunderstanding of Work-Potential Energy Theorem?

This is a relatively basic question, but I don't understand why it is the case. This is from my dynamics book and is mainly a mathematical misunderstanding. $$ \ dU = F\cos\theta ds $$ Which means ...
1
vote
1answer
9k views

Derivation of formula of potential energy by a conservative force [duplicate]

the formula for potential energy by a conservative force is given by: $$ F = -\nabla U(r), $$ which in one dimension may be simplified to: $$ F = -\frac{dU}{dx} .$$ My question is how is it ...
2
votes
3answers
4k views

Potential energy graphs of chemical systems

I really wish someone could dissect this for me in the language of physics. The system is that of two atoms that approximate each other along 'r' (or distance themselves apart). My concerns are ...
0
votes
1answer
482 views

The formula used to calculate electrical potential energy

Sorry for the ugly picture but it makes my question more understandable. The $\Delta V$ from $A$ to $B$ is calculated by$$\int_A^B E \, \mathrm{d}r$$ where $r$ is the distance between $A$ and $B$. The ...
3
votes
2answers
1k views

Electrostatic Potential Definition

In the book, Introduction to electrodynamics by David J. Griffiths, he introduces potential separately as a function and potential energy through that function. How can potential be defined before ...
6
votes
3answers
5k views

Gravitational Potential of a Sphere vs Gravitational Binding Energy of a Sphere

My question is about two equations regarding uniform spheres that I've run into: $\quad V=\frac{GM}{r},$ and $\quad U = \frac{3}{5}\frac{GM^2}{r}.$ 1) On one hand, $V$ is unknown to me, and is ...
1
vote
3answers
4k views

What is meant by potential energy for a particle in a field?

Potential energy is usually defined using a field and a particle that experiences the field force, as the work down in moving a unit particle from infinity to a position in that field. But some ...