Gravity and Planets 26

What are the two directions that work together to make an object orbit

moving forward (velocity) and gravity

Mass

A measure of the amount of matter in an object

gravitational force

a pulling force between all masses in the universe

Newton's Law of Universal Gravitation

states that mass and distance affect the force of gravity

if the mass of an object were to increase then its gravitational force would …

increase

If the mass of an object were to decrease then its gravitational force would…

decrease

If the Earth would stop pulling on the moon what would happen to the moon?

It would fly off into space in a straight line

Milky Way Galaxy

Collection of stars, dust, and gas held together by gravity , where we live

universe

All of space and everything in it

Transit

When another planet or moon passes in front of another planet or the sun.

weight

A measure of the pull of gravity on an object

Vector

an arrow that shows strength and distance between two objects

Orbit direction

counterclockwise

In space smaller objects always orbit …

Larger objects

Stars

Do not move - they only seem to because Earth is moving

Planets move faster when …

They are closer to the sun

Planets move slower when…

They are farther from the sun

Which object has the most gravitational force? Sun, Earth, Moon

The sun

Why do planets rotate around the sun?

the sun has the most mass and the most gravitational force

If two objects of the same size moved AWAY from each other would there be more or less gravitational force

Less

If two objects of the same size moved CLOSER to each other would there be more of less gravitational force

MORE

If earth stopped moving in orbit what would happen to it?

It would fall into the sun

terrestrial

Earth or land; worldly

celestial

having to do with the sky or space

black hole

An object whose gravity is so strong that nothing, not even light, can escape.