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Geocentric Model

Earth is at center of solar system

Heliocentric Model

Sun is at center of solar system

Copernicus

Astronomer who proposed heliocentric model

Ptolemy

Astronomer who proposed the geocentric model

Kepler

Had three laws of planetary motion

Kepler's first law of planetary motion

The orbit of planets is an ellipse

Kepler's second law of planetary motion

If you increase the distance from the sun, the planet moves slower.

Kepler's third law of planetary motion

If you increase the distance from the sun, it will increase the time to move around the sun.

Newton's 1st Law of Motion

If an object is moving at a constant speed, then it will continue to move at constant speed unless acted upon by an outside force.

Newton's 2nd Law of Motion

Acceleration = F/M

Newton's 3rd Law of Motion

For every action, there is an equal and opposite reaction.

If the masses of two objects increase, then the force of gravity between the two objects will

increase

If the force with which you push an object increases, then the acceleration of that object will

increase

If the mass of an object increases and the force on that object remains the same, then the acceleration of that object will

decrease

Mass

Amount of matter in an object

Weight

The force of gravity on an object

Acceleration Equation

A = F/M

Would you weigh more or less on a planet with a larger mass?

v

Would you weigh more or less on a planet with a smaller mass?

less because the planet has a smaller gravitational pull on you than earth

Planets that weigh more

Jupiter, Saturn, Neptune

Planets that weigh less

Mercury, Venus, Mars, Uranus

Shape of a planet's orbit

ellipse

Planet with the slowest speed

Neptune

Neptune has the slowest speed because

it has the weakest gravitational attraction between the sun and planet.

Planet with the fastest speed

Mercury

Mercury has the fastest speed because

it has the strongest gravitational attraction between the sun and the planet

Four inner planets

Mercury, Venus, Mars, Earth

Four outer planets

Saturn, Jupiter, Uranus, Neptune

Difference between inner and outer planets

The inner planets are small, solid, and have no rings. The outer planets are large, gaseous, and have rings

Location of asteroid belt

Between Mars and Jupiter

Location of Kuiper Belt

Outside Neptune's orbit

Name a planet that is considered a dwarf planet

Pluto

Meteoroid

Rock or fragment traveling in space

Meteor

Meteoroids pass through atmosphere

Meteorite

Meteoroid reaches Earth's surface

Difference between meteoroid, meteor, and meteorite

The location of the object

Crater

Large hole at the Earth's surface created by a meteorite or asteroid

Kuiper Belt

Comet or ecliptic plane

Oort Cloud

Further long period comets

decreases

If the two objects move further apart, what happens to the force of gravity between the two objects?

If the force with which you push an object decreases, then the acceleration of that object will__________________

Decrease

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