What actually is energy?

  • Thread starter Abhi9826
  • Start date
  • #1
7
1
Hey we know a general definition about Energy that it is capacity to do work...Or to do work energy is required.....But this doesn't make any sense to me..
If someone ask me about Energy I becomes speeches .So Please explain me about the Energy....
 

Answers and Replies

  • #2
DrClaude
Mentor
7,599
3,988
I think that no-one explained that better than Feynman: http://www.feynmanlectures.caltech.edu/I_04.html

The conclusion is
R. P. Feynman said:
It is important to realize that in physics today, we have no knowledge of what energy is. We do not have a picture that energy comes in little blobs of a definite amount. It is not that way. However, there are formulas for calculating some numerical quantity, and when we add it all together it gives “28”—always the same number. It is an abstract thing in that it does not tell us the mechanism or the reasons for the various formulas.

I would also add that one can say that "energy" is the conserved quantity due to the fact that physical systems are invariant under time translation, see https://en.wikipedia.org/wiki/Noether's_theorem#Example_1:_Conservation_of_energy
 
  • #3
BvU
Science Advisor
Homework Helper
14,396
3,708
Hello Abhi, :welcome:

Did you perform a thorough search before posting this ? What was it you specifically don't understand ? There's a lot to say about energy, but others need assistance too.
 
  • #4
Dale
Mentor
Insights Author
2020 Award
31,292
8,053
Hey we know a general definition about Energy that it is capacity to do work...But this doesn't make any sense to me
What part of the definition is confusing to you? Do you have trouble with what "work" means or what "capacity" means?
 
  • #5
7
1
Actually I didn't understand what the Energy is...In general we say sound , radiation ,chemical bonds ,mass or any thing which is under any field (magnetic or electronic ) is Energy or posses energy...So we relating energy to everything....
 
  • #6
7
1
Hello Abhi, :welcome:

Did you perform a thorough search before posting this ? What was it you specifically don't understand ? There's a lot to say about energy, but others need assistance too.
I have been thinking about this since a long time but I didn't got any suitable meaning to me...
 
  • #7
ZapperZ
Staff Emeritus
Science Advisor
Education Advisor
Insights Author
35,847
4,676
I have been thinking about this since a long time but I didn't got any suitable meaning to me...

You need to step back and see if you actually understood what you are asking. For example, ask yourself "What is an apple?" and see if you can answer this. Then look at the answer you gave yourself on something that you think you know.

You will find that your answer will include descriptions such as "It is a fruit" (which is really a classification of the object), "It can be eaten", "It looks like this" (accompanied by a number of pictures of different types of apples), "It tastes like..... an apple" (which assume that others understand and have a reference point to what an apple should taste like), etc... etc.

In other words, all you can give are ...... drum roll..... DESCRIPTIONS of the PROPERTIES of an apple.

What an object is is nothing more than a series of its properties and descriptions. So what you ask "What is X?", we have no other abilities than to describe to you the properties and characteristics of X.

Unfortunately, based on how you asked about energy in this thread, it appears as if you are seeking something beyond that, and frankly, something that doesn't really exist based on how we understand things. Asking "What is energy?" will inevitably results in us giving you all the properties and description of energy based on the physics of it. It is not just one description. It is a series of description, just like the apple.

We have had numerous threads in this forum asking for the same thing. You never responded to the question on if you've done any search.

Zz.
 
  • #8
7
1
You need to step back and see if you actually understood what you are asking. For example, ask yourself "What is an apple?" and see if you can answer this. Then look at the answer you gave yourself on something that you think you know.

You will find that your answer will include descriptions such as "It is a fruit" (which is really a classification of the object), "It can be eaten", "It looks like this" (accompanied by a number of pictures of different types of apples), "It tastes like..... an apple" (which assume that others understand and have a reference point to what an apple should taste like), etc... etc.

In other words, all you can give are ...... drum roll..... DESCRIPTIONS of the PROPERTIES of an apple.

What an object is is nothing more than a series of its properties and descriptions. So what you ask "What is X?", we have no other abilities than to describe to you the properties and characteristics of X.

Unfortunately, based on how you asked about energy in this thread, it appears as if you are seeking something beyond that, and frankly, something that doesn't really exist based on how we understand things. Asking "What is energy?" will inevitably results in us giving you all the properties and description of energy based on the physics of it. It is not just one description. It is a series of description, just like the apple.

We have had numerous threads in this forum asking for the same thing. You never responded to the question on if you've done any search.

Zz.
Sorry I have just joined this forum...
 
  • #9
ZapperZ
Staff Emeritus
Science Advisor
Education Advisor
Insights Author
35,847
4,676
Sorry I have just joined this forum...

Unfortunately, this doesn't tell me if you've understood what you read, or why "just joined" has anything to do with this discussion.

Zz.
 
  • #10
BvU
Science Advisor
Homework Helper
14,396
3,708
Sorry I have just joined this forum...
No need to apologize. But you have to help us a little bit by clarifying what we can do to provide you with a useful answer. :smile:
 

Related Threads on What actually is energy?

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
13
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
7
Views
1K
  • Last Post
2
Replies
37
Views
4K
  • Last Post
Replies
1
Views
4K
Replies
2
Views
1K
  • Last Post
Replies
3
Views
48K
Replies
2
Views
4K
Replies
3
Views
1K
Top