Astronomy and Physics Flashcards Preview

8th Grade science > Astronomy and Physics > Flashcards

Flashcards in Astronomy and Physics Deck (34):
1

Astronomy

The study of the universe

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Rotation

The spin of a body on its axis

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Revolution

The travel of one body around another

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Orbit

The path that a body follows around another

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Axis

An imaginary line on which the earth spins

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Satellite/moon

A natural or artificial body that revolves around a planet

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Light-year

The distance light travels in a year

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Astronomical Unit

The distance between the Earth and The Sun

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Star

A Large object made of gas the produces light & heat by nuclear fusion

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Black Hole

An area in space where the force of gravity is so strong that even light cannot escape

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Constellation

A group of stars that forms a recognizable shape from our perspective on Earth

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Day

One rotation of Earth's axis

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Year

One revolution around the sun

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How long does it take for the Moon to orbit the Earth

A Month

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What term describes the phase in which less than half of the moon is visible.

Crescent

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What term describes the phase in which more than half of the moon is visible.

Gibbous

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What celestial object can be referred to as a 'dirty snowball'

a comet

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7.785 x 10^8

778,500,000

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1,433,000,000

1.433 x10^9

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How long ago did the Big Bang happen

13.7 billion years

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When did our solar system form

4.7 billion years ago

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What will happen 5 billion years from now

sun will expand into red giant

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what will happen to the Sun after it becomes a red giant

It will blow up into a planetary nebula and the remaining core will be a white dwarf

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Meteoroid

A small particle from an asteroid or comet orbiting the Sun.

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Meteor

A meteoroid that is observed as it burns up in the Earth’s atmosphere – a shooting star.

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Meteorite

A meteoroid that survives its passage through the Earth’s atmosphere and impacts the Earth’s surface.

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What is a free body diagram

A simplified representation of an object that shows the forces acting on it.

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what does it mean when forces are unbalanced

an object is in motion

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Newton's First Law

An object at rest remains at rest and an object in motion remain in motion unless acted upon by an unbalanced force.

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Newton's second law

The acceleration of an object depends on the mass of the object and the amount of applied force.

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Newon's Third law

Whenever an object exerts a force on a second object the second object exerts a equal and opposite force on the first object.

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The law of conservation of energy

The law that states that energy cannot be created or destroyed but can be changed from one form to another.

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Kinetic energy

the energy of an object that is due to the object's motion

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potential energy

the energy that an object has because of position, shape or condition.