All Questions
6
questions
-2
votes
5
answers
106
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When an object is thrown towards the sky it starts to gain potential energy, why?
I didn't think so because when an object is thrown towards the sky it already has kinetic energy and it looses it's energy due to the gravitational force of the earth.
When the object looses all of it'...
-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
3
votes
4
answers
3k
views
Why is the mechanical energy of a free falling object conserved?
My textbook says that in an isolated system (when there is no external force and the internal forces are conservative)the mechanical energy of the system remains constant.
It then states the example ...
-1
votes
3
answers
4k
views
Will a body necessarily posses zero kinetic energy at infinity?
I have been studying about gravitation for a while and most of the books(including fundamental of physics) while defining escape velocity assumes that kinetic energy of a body at infinity is zero (...
- 1,829
0
votes
2
answers
328
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Why did Trebuchet have so long throwing arms?
Have a look at such an historical Trebuchet:
As you can see, the throwing arm (left) is much longer than the weight arm (right).
Law of conservation of energy says, potential energy from the weight ...
- 103
1
vote
2
answers
2k
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What is the most efficient machine for translating gravitational potential energy of one mass into kinetic energy of a different mass?
As the question states, what is our current best machine for translating falling gravitational potential energy, such as a large weight, into launching a smaller projectile vertically? A lever? A ...
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