E=mc2 How did Einstein get to this equation?

  • #1
How did Einstein get to this equation?...I mean the math behind it and why E=mc2? why not F=mc2? we can get so much force from m*c2 right? but why did Einstein write E=mc2? :smile:
 
Last edited by a moderator:

Answers and Replies

  • #3
bcrowell
Staff Emeritus
Science Advisor
Insights Author
Gold Member
6,723
423
Here is Einstein's original paper on the topic, which is actually pretty readable: http://fourmilab.ch/etexts/einstein/E_mc2/www/

Of course there's no particular reason that we have to go about things exactly the same way as Einstein. There are various ways of getting this result.

In general, you're not well advised to try to learn relativity from scratch simply by posting questions on this forum. You need a book to present things in an organized way. Some good books about special relativity are (from easiest to hardest):

Takeuchi, An Illustrated Guide to Relativity
Mermin, It's About Time: Understanding Einstein's Relativity
Taylor and Wheeler, Spacetime Physics

The advantage of Takeuchi and Mermin is that they require very little background in math or physics. Their disadvantage is a total lack of connection to experiment.
 
  • #5
Here is Einstein's original paper on the topic, which is actually pretty readable: http://fourmilab.ch/etexts/einstein/E_mc2/www/

Of course there's no particular reason that we have to go about things exactly the same way as Einstein. There are various ways of getting this result.

In general, you're not well advised to try to learn relativity from scratch simply by posting questions on this forum. You need a book to present things in an organized way. Some good books about special relativity are (from easiest to hardest):

Takeuchi, An Illustrated Guide to Relativity
Mermin, It's About Time: Understanding Einstein's Relativity
Taylor and Wheeler, Spacetime Physics

The advantage of Takeuchi and Mermin is that they require very little background in math or physics. Their disadvantage is a total lack of connection to experiment.

You're right sir :smile:
I want to know everything but not in an organized way :smile:
Thank you :rolleyes:
 
  • #6
Pengwuino
Gold Member
4,989
16
How did Einstein get to this equation?...I mean the math behind it and why E=mc2? why not F=mc2? we can get so much force from m*c2 right? but why did Einstein write E=mc2? :smile:
By the way, F = mc^2 makes no sense. The right hand side is a unit of energy, the left is a unit of force. In fact, once you read up on it a little, you'll see that E = mc^2 applies to an object just sitting there - it has an inherent energy associated with it just by existing. Talking about forces in that context is like asking how much speed I can get out of a car that has no wheels.
 

Related Threads on E=mc2 How did Einstein get to this equation?

  • Last Post
2
Replies
38
Views
39K
Replies
8
Views
3K
  • Last Post
Replies
13
Views
11K
Replies
7
Views
4K
Replies
4
Views
3K
Replies
1
Views
2K
  • Last Post
Replies
6
Views
2K
Replies
3
Views
4K
  • Last Post
2
Replies
27
Views
9K
  • Last Post
Replies
6
Views
4K
Top