Here, movement comes from an external source. Per Einstein, a body moves under the influence of gravity. Does this really happen or is this a mathematical construct? With black holes and the pre-big bang moment (where time is zero?), gravity pulls toward a dot. They via gravity pull energy-mass toward the center. For example, he says that there is a “quantum force” and that “friction” and “pressure” are forces “in the usual sense” along with “electric and magnetic forces.” He writes that “interatomic forces” and he also refers to “external forces such as gravity.” Regarding the word “such,” what other external forces are being referenced? Is Schumacher loose with his terminology? He references gravity as one of the well-known four forces, but elsewhere he uses the “force” terminology differently. Gravity is the “King of Cosmology.” As the universe expands toward heat death, will there be gravitational effects among the galaxies? Schumacher states that there’s no place in the universe that is immune from gravity. The course guidebook helped more than the lectures themselves, though I will probably listen to them again down the road.Ī few things that were highlights or questions for me: Often in this lengthy lecture series, I found it difficult to process what Schumacher was saying.
The relativity sections are where the professor excels with some novel explanations and insightful analogies. The pace before is too slow and the ones after is too fast. The best sections are the chapters on the relativity. In almost all such cases, the points could have been made without the equations and through the descriptions. There are multiple instances where the professor needlessly resorts to equations to make his points, which is unsuitable for an audio course. The same problem resurfaces in the "language" used. In contrast, the back half's pace would often befuddle readers who have done multiple courses on relativity. The first half of the book appears aimed at the students utterly unfamiliar with the most basic concepts of the Newtonian or even the Copernican models. The professor spends more time on far simpler concepts of early gravity-linked discoveries of the seventeenth and the eighteenth centuries than on the relativity and afterward. The problem is the course's undecided positioning and uneven pace. Professor Schumacher arduously avoids Quantum Physics, including the contradictions with relativity, which allows him to focus so much more on the wholly independent branch of Physics that is as important as any but rarely discussed in isolation. The most important thing going for the course is its singular focus on gravity.
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