Transcript Kepler`s Laws

Kepler’s Laws
Bellringer
• On your own sheet of paper and without
looking at the book list Kepler’s Laws of
Planetary Motion. We will be grading
these in class.
Link Activity
• In groups of three you will be making a 4
paper poster (see examples on the board
on what at 4 paper poster looks like).
• Paper 1= Title and group member names
• Paper 2= Kepler’s 1st Law
• Paper 3= Kepler’s 2nd Law
• Paper 4= Kepler’s 3rd Law
Link Activity
• Name of law ( Equal Areas, Ellipses, or
Periods)
• Definition of law in your own words
• Analogy and explanation
• Picture of analogy
• Color
Link Activity
• Name of law ( Equal Areas, Ellipses, or
Periods)
• Definition of law in your own words
• Analogy and explanation
• Picture of analogy
• Color
Astronomers Contributions
• 1. Revised the reflective telescope and
uses it to discover the moons of Jupiter,
sunspots, and craters on the moon.
• 2. Proposed the geocentric model of the
solar system
• 3. Proposed the heliocentric model of the
solar system
Astronomers Contributions
• 4. Predicts motions of the sun, moon,
stars, and planets.
• 5. Proposed the three laws of planetary
motion. Protégé to Brahe.
• 6. Discovered that comets were further
from the Earth than the moon. Gathered
years of precise observational data with
minimal equipment.
•
ES.2.2 Understand that and describe how in the 16th
century the Polish astronomer Nicholas Copernicus
suggested that all those same motions outlined by
Ptolemy could be explained by imagining that the Earth
was turning on its axis once a day and orbiting around
the sun once a year. Note that this explanation was
rejected by nearly everyone because it violated common
sense and required the universe to be unbelievably
large. Also understand that Copernicus’s ideas flew in
the face of belief, universally held at the time that the
Earth was at the center of the universe.
Kepler’s Laws
• Law 1: Law of Ellipses. Planets travel in
an elliptical (oval) shape around the sun
• Law 2: Law of Equal Areas. The closer
the planet is to the sun that faster it will go
around the sun because of the
gravitational pull of the sun.
• Law 3: Law of Periods. The closer the
planet is to the sun the less distance is
has to move to go around the sun.
Ch. 27 Vocabulary
• Gravity- The force that exists between two
bodies in the universe
• Planet- Any of the 8 primary bodies that
orbit the sun
• Orbital Period- The time required for a
body to complete a single orbit
• Solar Nebula- A rotating cloud of gas and
dust that gave rise to the Earth’s solar
system
Vocabulary Cont.
• Planetesimal- A small body from which a planet
originated in the solar system’s early
development.
• Protoplanet- A large body formed when
planetesimals joined together.
• Ultraviolet Radiation-Visible light that has
SHORTER wavelengths than those of light
• Infrared Radiation- A part of the
electromagnetic spectrum with waves LONGER
than those of light
• Rotation- The spin of a body on its axis.
Ex. Earth spinning around itself
• Revolution-The motion of one body around
another body in space. Ex. Earth moving
around the sun