Chapter 4b

The Laws of Motion Part II

Galileo, Kepler, Tycho, Copernicus, Comets, Tides

Galileo Galilei

The Moons of Jupiter in action, Video:

Galileo claims that the earth in NOT the
center of the universe. Aristotle was wrong.

Galileo recants and is spared but placed
under house arrest for the rest of his life.


Tycho Brahe measured the planets
which allowed Kepler to find the
Laws of Planetary Motion

Demo to Prepare:

For Kepler's Laws:
Plumber's Helpers & String to draw ellipses.
Masses, string, and glass tube for orbiting.

Elliptical orbits cause planetary motion to vary orbital speed. Video:

Galileo discovered sunspots showing
that the sun rotates on its axis.

The Aurora Borealis

Ions from Solar Eruptions (prominences) are guided to the Earth's Poles by magnetic fields. The ions interact with molecules in the atmosphere to make awesome colors.

Review of Tides

Apogee and Perigee of the ellipse. Video:

Here Endeth Chapter 4b

Go to Chapter 4a