All Questions
40
questions
1
vote
3
answers
134
views
Why do things always want to reduce their energy? [duplicate]
Every object wants to reduce its potential energy, but why is that so? Does it have an explanation, or is it just a law we accept?
- 53
1
vote
0
answers
77
views
Force in the Casimir effect
In the Casimir effect, after performing the regularization, it is found that the zero point energy between two conducting plates in a distance $L$ from eachother is (in the 1D case),
$$E=-\frac{\hbar ...
- 97
0
votes
3
answers
91
views
Where does the energy goes if the force is parallel to the displacement? [duplicate]
So, we all know that if force is perpendicular to the displacement, then work done is 0. But to generate force, I have to use up some of my energy. Had the angle not been perpendicular, my energy ...
-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?
1
vote
2
answers
155
views
Is Energy stored Force?
I am currently studying the relationships between energy work and force. I am trying to conceptualize them into one concept of causality. When a force is applied work is done, and energy is ...
0
votes
4
answers
2k
views
Energy and Force relationship
Is it right to think of Energy being what allows force(s) to happen? I know this is rather vague but is that a valid understanding?
- 113
2
votes
3
answers
322
views
How does a body know where it has min/max energy?
So today I was learning about equilibrium and I got to know that a body moves away from an unstable equilibrium because its potential energy at the unstable equilibrium is high. For example, in a ...
- 111
0
votes
1
answer
64
views
Convert horizontal wind movement of a swaying tree into vertical movement under the tree
How to efficiently convert the horizontal wind movement of a swaying tree into vertical movement under the tree? One way I can imagine is by tying a rope to a point in the ground some distance from ...
0
votes
2
answers
197
views
How exactly is potential energy and work done defined in this example?
Suppose I have a book kept on the floor. I pick it up, and keep it on the table, at a constant velocity. This means I've to apply a force $mg\hat{y}$ to counteract the force of gravity. The work that ...
- 493
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
-3
votes
1
answer
61
views
Is energy, as we know it, "persistent"? [duplicate]
Suppose I raise a ball (with my hand) to some height. I am doing some work against gravity and storing potential energy in the ball.
However, once I loosen my grip, or just sweep my hand away from ...
- 71
-1
votes
3
answers
56
views
Confirmation on Potential energy of an object
I very well understand that a lot of people have asked the question "where does potential energy come from" on this site, but mine is more of clarification.
If an object was propelled from ...
- 117
0
votes
2
answers
120
views
A ball released is released from a height “h” it touches the ground and bounces to a higher surface
So the ball bounces and to a higher surface which has a height equal to h/2 it’s potential energy would be equal to mgh/2 with respect to the higher surface my question is , what happens to the “extra ...
- 356
1
vote
2
answers
150
views
Work done when you bring an bringing an object down from a height
I am going to explain this question through an example.
Suppose I lift an object I apply a force $mg $ then I apply additional force, that would be $ma $ so total force would be $m(g+a)$. My doubt is ...
- 356
5
votes
13
answers
4k
views
Energy transfer during perfectly elastic collision between bodies of same mass
My question is similar to this one but it is for sure not a duplicate of it. I basically want to see the same scenario in terms of energy transfer.
What I know for sure is that bodies under collision ...
- 8,220