All Questions
42
questions
-1
votes
3
answers
426
views
How does gravitational potential energy work in a very large distance?
Consider a thought experiment (that I made when I was in high school) involving a universe with only two objects: a massive planet and a small asteroid. Initially, they are millions of light-years ...
- 109
0
votes
2
answers
55
views
Work done by gravity confusion
Say we had an object at height $h$ in a gravitational field, and of mass $m$, its GPE would equal $mgh$, now say we dropped it and it fell a distance of $h$, the work done on the object would be equal ...
- 195
-1
votes
2
answers
212
views
Why does GPE convert to kinetic energy? [closed]
What is it about GPE that makes it transfer to kinetic energy, why does it do this? What is GPE?
0
votes
2
answers
86
views
Is the topic of gravitational potential energy convoluted and unnecesary? [closed]
If we throw an object upwards from the surface of the Earth, we do some work on it to give it kinetic energy. Now as it travels up, Gravity of the Earth does negative work on it till it loses all the ...
0
votes
1
answer
54
views
Why Gravitational Potential is same In Both these cases?
We usually choose Reference point as Infinity which is Linear to the Points
and by this way we gat work done as both force and displacement are in the same direction as well as in the same line which ...
- 121
2
votes
2
answers
672
views
Change in gravitational potential energy when the work is zero
I may be misunderstanding the whole concept , but my doubt is this.
Let us say there is an isolated system comprising of a rock and the Earth. If I was to lift the rock up with a force equal to the ...
- 71
0
votes
0
answers
57
views
Confusion about an explanation for gravitational's potential energy
So we know that $\Delta U = -W$, where $\Delta U$ is the difference of potential energy and $W$ the work done by the force to move the body from point A to point B.
When analyzing this for the ...
- 21
0
votes
3
answers
1k
views
From where does object gains gravitational potential energy?
If an object is moving upwards with constant velocity in which upward force is supplying energy and gravity is extracting energy till height ($h$), so from where it gained potential energy?
Please ...
- 11
0
votes
2
answers
57
views
If the change in potential enegry is equal to the negative of the work done, then this principle isn't consistent here in the case freely falling body
Let us assume that a body of mass $m$ falls from height $h_1$ to $h_2$ :
Here the Work done by gravitational force (Conservative force) is :
$$\mathrm{Force \ ×\ Displacement} = mg \ (h_2-h_1) \tag1$$
...
7
votes
3
answers
1k
views
How is gravitational potential energy $mgh$?
I know the derivation that $W=Fd$, hence $F=mg$ and $d=h$ so energy gained by the body is $mgh$ considering the body on the ground to have $0$ gravitational potential energy.
But the definition of ...
- 1,168
0
votes
2
answers
237
views
Total energy of a satellite
I have learnt that change in potential energy in any conservative force field is equal to the negative of work done by that field through a distance. While applying the same for gravitational ...
- 727
0
votes
2
answers
55
views
Energy to counteract gravity without doing work? [duplicate]
Say I wanted to keep a body of 10kg at a certain altitude above the ground. If I elevate it 1m with my own arms or by any other means (with a drone, pulley system...) I'm spending energy in the form ...
- 115
0
votes
4
answers
510
views
How work done by a force on a body is negative?
The work done is the product of force acting on a body and the displacement of the body in the direction of the force.
The gravitational potential $\text{energy}=Mgh$ is the negative of the work done ...
-1
votes
2
answers
46
views
The effect of potential energy in the absence of conservative force [closed]
Imagine a hypothetical situation, where we throw a ball from the earth's surface and after certain time $t$ the ball's final velocity is equals to 0. And a that instance, gravity doesn't exist (...
- 483
1
vote
1
answer
93
views
Some questions regarding graviational potential energy and the concept of potential energy in general
Starting off, I first want to know the relation between work and potential energy.
$\Delta\mathbf U = - W $
How was this expression formulated?
Moving on,
My second doubt was in the derivation of the ...
- 82