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15 Cards in this Set

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Force

A push or pull exerted on an object

Gravity

The attractive force between two objects, it's strength depends on their masses and the distance between them

Law of universal gravitation

The scientific law that states all objects in the universe attracts every other object

Mass

The amount of matter in an object

Weight

The force of gravity on an object

Inertia

The tendency of an object to resist a change in motion

Newton's first law of motion

The scientific law that states that an object at rest will stay at rest unless affected by a force, and an object in motion will stay in motion unless acted on by a force

Astronomy

The study of objects in space

Axis

The imaginary line that goes through Earth's center, as well as the North and South poles

Rotation

The spinning motion of a planet on it's axis

Revolution

The movement of one object around another

Orbit

A path of an object as it revolves around an object in space

Calendar

A system of organizing time that defines the beginning, lengths, and divisions of a year

Solstice

The two days of the year when the sun reaches it's greatest distance north or south of the equator

Equinox

The two days of the year on which neither hemisphere is tilted towards the sun