All Questions
Tagged with newtonian-gravity energy
125
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Constant energy in universe and spacecraft accelerating [duplicate]
Given that the energy in the universe is constant, how is it that spacecrafts traveling far distances sometimes get a boost by falling into the gravitational field of a planet? Acceleration caused by ...
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2
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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?
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2
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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 ...
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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
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Why does the calculus derivation for Universal Gravitational Potential Energy not follow calculus laws and become $W=GMm/r$ instead of $W=-GMm/r$? [closed]
So we know that Universal Gravitational Potential Energy is $U=-Gm1m2/r$ where $G$ is the Gravitational Constant and $r$ is the distance between centers of mass. However, the derivation has me ...
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15
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Is it possible to convert gravitational energy directly into electrical energy?
It is possible to produce strong gravitational accelerations on the free electrons of a conductor in order to obtain electrical current. This allows the conversion of gravitational energy directly ...
- 1,070
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Meaning of kinetic energy and non-contact forces
My textbook gives the following physical interpretation for kinetic energy:
The kinetic energy of a particle is equal to the total work that particle can do in the process of being brought to rest.
...
user332598
2
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2
answers
672
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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
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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
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3
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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 ...
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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 :
$$\mathrm{Force \ ×\ Displacement} = mg \ (h_2-h_1) \tag1$$
...
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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 ...
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Will a rocket need the same fuel and energy going 1 g upwards on Earth as a rocket 1 g in space?
Will the gravity of Earth change the result (making the rocket on earth need more fuel and energy than the one in space)? Or it is the same?
user293241
1
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2
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A question on vertical spring mass systems
For a given mass attached to a vertical spring (near the surface of the earth), how do we know that the equilibrium point is halfway between its oscillation? (Let the height at the bottom of ...
- 155
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Limitations Of Work-Energy Theorem
Consider the given system which shows a chain $AB$ of length $l$ and the end $A$ is held at rest.
Suppose we release the chain at time $t=0$. How do we find the velocity of the chain when the end $A$ ...
- 117