Geocentric vs Heliocentric models

Multiple Choice

Who were the people that popularized the geocentric model?

• Galileo and kepler

• Aristotle and Ptolemy

• Copernicus and Aristarchus

• Brahe and Kepler

Multiple Choice

What is the biggest difference between the Geocentric Model and the Heliocentric Model?

• the shape of the planets' orbits

• the movement of the moon

• the object at the center of the universe

• the brightness of the sun

Multiple Choice

What does "geo-" mean?

• Earth

• sun

• Center

• Moon

Multiple Choice

What is the name of this model?

• Heliocentric Model

• Geocentric Model

• Circle Model

• Aristotle Model

Multiple Choice

What does the word "Helio" mean?

• Earth

• Mars

• Sun

• Juputer

Multiple Choice

The Sun is considered to be the center of the solar system:

• Heliocentric model

• Geocentric model

Multiple Choice

What is the name of this model?

• Heliocentric Model

• Kepler Model

• Galileo Model

• Geocentric Model

Multiple Choice

What is at the middle of a Geocentric system?

• Sun

• Neptune

• Earth

• The Universe

Multiple Choice

What did Ptolemy's and Aristotle's model have in common?

• Both models had Earth as the center of the solar system.

• Both discovered galaxies beyond the Milky Way.

• Both models had the sun as the center of the solar system.

• Both model had objects in solar system have epicycles.

Multiple Choice

Who proposed the Heliocentric system?

• Copernicus

• Ptolemy

• Aristotle

• Galileo

Multiple Choice

What Model is where the sun is the center of the universe?

• Geocentric
• Heliocentric
• Earth's rotations
• Earth's planets

Multiple Choice

What does the Earth do in the heliocentric model?

• Stays still

• Only rotates

• Only revolves

• Rotates and revolves

Multiple Choice

Which model includes the concept of the Earth spinning on its axis?

• Geocentric

• Heliocentric

• Lunar-centric

• Solar-centric

Gravity Part 2

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Effects of Mass & Distance on Gravitational Force

• The more massive an object, the greater it's gravitational pull

• The closer the distance between objects, the greater the gravitational pull
  

• The gravitational pull between the Sun and each planet or between Earth and it's moon causes distinct motions between and among the objects

Multiple Select

If the mass of an object increases, what happens to the gravitational pull?

• Increases

• Decreases

Multiple Select

The closer that two objects come together, what happens to the gravitational pull?

• Decreases

• Increases

Effects of Gravity on Planetary Orbits

• The Sun's gravitational attraction along with a planet's inertia (continued forward motion), keeps the planets moving in an elliptical orbit (slightly oval) & determines how fast they move.

Effects of Gravity on Planetary Orbits

• Planets nearer to the Sun move/orbit faster due to the higher gravitational pull from the Sun.

• Planets farther from the Sun move/orbit slower due to the gravitational pull becoming less the farther from the Sun a planet is located.

Mercury, Venus, Earth, Mars

4 planets closest to the Sun that orbit faster because of higher gravitational pull between them and the Sun

Jupiter, Saturn, Uranus, Neptune

Even though these 4 planets are more massive, the large distance that they are from the Sun reduces the gravitational pull the Sun has on them.

Multiple Choice

Inertia is:

• Forward motion

• Reverse motion

• Sideways motion

Multiple Choice

Planets closer to the sun have:

• More gravitational pull with the Sun

• Less gravitation pull with the sun

Multiple Choice

What keeps planets in elliptical orbits?

• Gravitational attraction

• Inertia

• Both gravitational attraction & inertia

• Neither one

Planetary Motion

According to Kepler, Newton, and Einstein

Multiple Choice

The earth is at the center of a ___ model.

• heliocentric

• geocentric

​Watch this simulation carefully. Notice how the motion of Mercery changes from the view point of earth.

Multiple Choice

Retrograde describes a planet that looks like it is going ___.

• backwards

• forwards

Open Ended

Ptolemy hypothesized or proposed that planetary motion was like this image. Explain what empirical evidence he used to com to this conclusion. Then explain why it appeared this way to him.

Multiple Choice

The heliocentric model has the solar system orbiting the ___.

• sun

• earth

Multiple Choice

Planets travel in ____ orbits.

• elliptical

• circular

Multiple Choice

The closer a planet is to the sun the ____ distance is covered in the same time.

• more

• less

• same

Multiple Choice

The closer an orbiting object is to the sun, the _____ it travels.

• faster

• slower

Multiple Choice

The forces between the sun and earth are ___, therefore the earth accelerates not the sun.

• equal

• unequal

Multiple Choice

The closer a planet is to the sun the ____ it travels.

• faster

• slower

Multiple Choice

The center of mass of the Earth-moon system lies ___

• in earth

• in the moon

• between the earth and moon

Multiple Choice

Massive objects cause spacetime to ___.

• curve

• do nothing

Multiple Choice

Planets don't fall into the sun because ___.

• there is little friction

• there is no gravity