Is self-study with Feynman's Lectures enough for UnderGrad physics?

In summary: Energy is conserved" is a statement about the physical world, not about physics. It is a law of nature. It is one of the most important laws of physics, and it is very useful for understanding many physical phenomena.Energy is conserved because the total amount of energy in an isolated system (such as a block of matter, a star, or a human body) remains the same over time. The energy in a system can be transformed from one form to another, but the total amount of energy remains the same.
  • #1
xavier_r
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Well, I have got hold of Feynman's Lectures Volume 1,2,3...
I am trying to understand UnderGrad physics through self-study at home...

Are those 3 books enough to understand (at least conceptually) UnderGrad level physics?
 
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  • #2
Those books present a comprehensive view of concepts used in Physics, at mid-level to advanced undergraduate sophistication. Understanding the material is a totally different question.
 
  • #3
Reading the Feynman Lectures on Physics, or any physics book, is not sufficient to really understand physics. It is also necessary to practice, by doing exercises, and the Feynman Lectures, Vols I - III do not include exercises. So, you should also find a collection of exercises to practice with. Please see my posts:

https://www.physicsforums.com/showpost.php?p=1829100&postcount=5
https://www.physicsforums.com/showpost.php?p=1829132&postcount=7

Michael A. Gottlieb
mg@feynmanlectures.info
 
  • #4
What do you mean by 'really understand'? If someone reads that 'energy is conserved' they have understood some physics without doing any sums. And the understanding seems real enough to me. OK to actually *do* physics you probably need to do some exercises. To deny possibility of understanding, real or not, to the everyday reader seems to be an attempt to perpetuate a priesthood. And if 'understanding worthy of the name' only comes from number crunching then why did Feynman expend so much effort on popular books and lectures?
 
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  • #5
By "really understand" I mean this: that given some well-defined physical situation, you can apply such concepts as conservation of energy to predict what will happen, with some precision.

Solving physics problems is not "number-crunching," unless you solve them numerically. It is, more generally, an intellectual process that (usually, but not always) requires some knowledge of (not necessarily advanced) mathematics, but even moreso, solving physics problems requires physical insight, an understanding of how to apply the concepts you have read about to real situations - that is what lies at the heart of a "real understanding" of physics. Unfortunately such insight is not gained by reading or listening to lectures alone - it can not be taught in any direct way, only by example, and it requires practice in applying the concepts you read (or hear) about to physical situations - that is why we make students do homework problems and take quizzes and tests, at Caltech.

You do not have to be a "priest" to work on physics exercises, as is well-demonstrated, for example in the solutions to physics problems posted at The Feynman Lectures website, by people from all over the world, from all walks of life and of all ages - people who are willing to do the work necessary to gain a real understanding of physics.

I do not think what I am saying is in any way unique to physics - it is true of many activities. For example, you can read all you want about chess, but unless you actually play the game, you can not understand it very deeply. You might know all the rules by heart, but that is only a superficial kind of understanding. As they say (with regard to weight-lifting) "No pain. No gain."
 
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  • #6
Okay. How do you get politicians to understand physics "well enough" to realize the importance of providing funding for a supercollider? What if politicians said "you can only 'really understand' politics by standing for office?" They would get voted out, sharpish.

But I see what you are getting at, and I think you are largely right, but I think you should use less value loaded words. For instance, you might say to "really practice" physics you need to do the work. And I apologise for the "number crunching" crack :-)

And remember, Einstein said you should be able to explain any physics concept to a barmaid, and thereby give them an understanding of any aspect of physics. Maybe you could even do that with politicians.
 
  • #7
"And remember, Einstein said you should be able to explain any physics concept to a barmaid, and thereby give them an understanding of any aspect of physics."

Einstein never said this, nor would he.

The original expression, 'an alleged scientific discovery has no merit unless it can be explained to a barmaid' is attributed to Rutherford. [See, for example: "Some Recollections and Reflections on Rutherford" by W. Bennett Lewis, Notes and Records of the Royal Society of London, Vol. 27, No. 1 (Aug., 1972), pp. 61, par. 1, and "Einstein: The Man and His Achievement" by G. J. Whitrow, pp. 42, par 2]

This quotation, which is very commonly misattributed to Einstein, serves as a good example of the necessity to carefully distinguish facts from popular beliefs (especially on the Internet).
 
  • #8
mal4mac said:
What do you mean by 'really understand'? If someone reads that 'energy is conserved' they have understood some physics without doing any sums. And the understanding seems real enough to me.

What, specifically is meant by "conserved?" Where does conservation of energy come from? Is it a special case of a more general phenomenon? Does "energy" manifest itself in other physical ways, or is it merely an interesting mathematical quantity? In fact, the most important question here is what the hell is energy, anyway?

If someone read that "energy is conserved," I submit that they have in fact understood absolutely nothing. By itself, it is a vacuous statement.

Physicists are not a priestly class; physics is not a religious vocation. "Real" understanding of physics is always available to people who aren't yet formally trained in it... It's just that a component of that understanding is "real" hard work, and merely reading someone else's words without trying your own hand is never going to cut it.
 
  • #9
codelieb said:
"And remember, Einstein said you should be able to explain any physics concept to a barmaid, and thereby give them an understanding of any aspect of physics."

Einstein never said this...

Thanks for the correction. Clark's biography backs you up (p.418). He says it was Rutherford who made the barmaid quip. But he quotes Einstein as making the same point with "child" replacing "barmaid".
 

1. What are the Feynman Lectures on Physics?

The Feynman Lectures on Physics is a series of three textbooks written by physicist Richard Feynman, which cover the fundamentals of physics at the undergraduate level. They are known for their clarity, wit, and insightful explanations of complex concepts.

2. Who is Richard Feynman?

Richard Feynman was a Nobel Prize-winning physicist who made significant contributions to quantum mechanics, particle physics, and the development of the atomic bomb. He was also known for his work in science education and his engaging teaching style.

3. Who should read the Feynman Lectures on Physics?

The Feynman Lectures on Physics are suitable for anyone interested in learning about physics, from high school students to professional scientists. However, they are most commonly used as a textbook for undergraduate physics courses.

4. What topics are covered in the Feynman Lectures on Physics?

The three volumes of the Feynman Lectures cover a wide range of topics, including mechanics, electromagnetism, quantum mechanics, thermodynamics, and statistical mechanics. They also touch on more advanced topics such as relativity and solid state physics.

5. Are the Feynman Lectures on Physics still relevant today?

Yes, the Feynman Lectures on Physics are still highly regarded and widely used today, despite being first published in the 1960s. The concepts and principles discussed in the books are still fundamental to our understanding of the physical world and are applicable to modern research and technology.

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