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Lecture3_1-15_

# Lecture3_1-15_ - The First Physics Problem By what law or...

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The First Physics Problem By what law or scheme are the Moon and planets moving?

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Retrograde Motion of the Planets Normally the planets move smoothly from west to east through the stars, but once a year when the planet is high in the midnight sky, it reverses this normal motion and moves “backward” through the stars. Fig 1.1 in text

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How to Solve a Major Physics Problem • 1. State the problem and the nature of the solution • 2. Assemble all the critical pieces • 3. Complete the solution.
The Problem of the Motion of the Moon and Planets 1. State the problem and the nature of the solution Greeks and Ionians There is a natural explanation It is logical-mathematical It should be simple and elegant Aristotle – - Geocentric model Heavenly motion is circles Terrestrial motion is rest or falling down Ptolemy -- circles and epicycles The heavenly motions are God’s perfect circles?? Fig 1.2 in text

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Motion of the planets 2 Step 2: Assemble all the critical pieces Copernicus in 1543 hypothesized that the planets revolved around the Sun rather than the Earth Fig 1.5 in text
1600 Galileo Describes motion in terms of acceleration Explains why things do not fall off the Earth owing to its motion Telescope shows phases of Venus and moons of Jupiter, confirming Copernicus Fig 1.8 in text

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Motion of the planets • Tycho Brahe 1546- 1601 – Provides exact observations of the planetary orbits
Motion of the Planets • 1610 Kepler analyzes the data to find constants of motion

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Lecture3_1-15_ - The First Physics Problem By what law or...

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