Newton Versus Einstein: The Way of Newton

When we wish to understand how the universe works, we need to start from the very beginning from the Greeks up through Newton, who gave us his magnum opus on motion and gravity. However, while it was a triumph, there were clouds on the horizon. Here, we learn all about Newton's formulation of Gravity.

This is the seventh of the videos in my new series of Cosmology. I'm going through Dr. Barbara Ryden's textbook "Introduction to Cosmology". If you follow along, you'll get a full upper-division undergraduate course in Cosmology. I used this textbook at William Paterson University.

This course will cover the current state of the science of Cosmology. To follow along, it'll be a good idea for you to ge to know your calculus. Here are the topics of this video:

Introductory Cosmology
Chapter 03: Newton versus Einstein
Section 01: The Way of Newton

Some things covered:
The History of Gravity.
What Exactly are the Forces of Nature?
Euclidean Space and Time.
I feign no hypotheses....
Testing the Equivalence Principle.
Gauss' Law of Gravity.
Deriving the Poisson Equation.
Gravity's Formulation and Usage.

Supplementary links:

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[Truth_Teller_]

Glad to see you back, Mr. Kendall. Hope all is well.

[Flash-srhm]

Theres a book called "murdered by isaac newton" which is an eye-opening look at how newton treated his fellow scientists. Newtons ego was larger than his sizable intellect.

[graham]

Thankyou..Mr kendall, I always enjoy your videos..

[Dragonblaster]

I have a copy of Newton's _Opticks, _ with a foreword by Albert Einstein, in which he acknowledges his debt to Newton.

[rchas]

How long would it take Newton to comprehend the mathematics underlying relativity? First Special, and then General?

[desdenova]

He would probably think that he was a blasphemous heathen who was shockingly lax in his alchemy and bible studies.

[garysnewjob]

27:35 In other words, "Shut up and calculate. " 😂 🎉

[tonibat]

Very nice lecture Dr Kendall. I enjoyed every bit of it, took notes like at the classroom.
I find however that your last statement about Einstein providing an 'explanation' of gravity, unlike Newtonian gravity (NG), looks a little optimistic.
GR is a necessary improvement and correction to NG, and a big step forward toward an eventual complete explanation. But does not yet provide the full picture.
When Nobel laureate David Gross was asked by Richard Panek 'What is gravity?', his answer was blunt and clear: 'I wish we knew' (See 2017 YT vid "Coming to grips with gravity" (2:40) ).
The rationale for the connection of mass to SPCT curvature is not provided by GR. Why does SPCT curve by the exact amount at every point, depending on the amount of mass, we still ignore.

The point is subtle, but significant.

[markhughes]

I think he might say ‘hey Albie - gravity’s an effect - not a thing…’

[peterwexler]

It's pronounced "prinnkippeeah. "C, " in the middle of a Latin word, is pronounced as a K.

[truthpopup]

Newton was no dummy. I think he would understand relativity if it had been explained to him.