Unit 1: Earth's Orbit and Barycenter Flashcards Preview

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Flashcards in Unit 1: Earth's Orbit and Barycenter Deck (33):
1

Barycenter

Center of mass between a planet an the Sun.

2

Law of Universal Gravitation

Every pair of bodies in the Universe attracts each other with a force related to the more mass a body has the stronger the pull and the closer the body is the stronger the pull (vise versa).

3

Why does the Sun wobble?

Because the 8 planets are pulling on it.

4

What does Earth actually orbit?

The barycenter of the Sun.

5

What does the Sun orbit?

The barycenter of the Solar System.

6

Earth's Axis

Imaginary line that goes through the North and South Poles.

7

What causes the day and night cycle?

The rotation of the Earth's axis spinning towards and away from the Sun (24hrs).

8

What actually happens when the Sun rises?

The Earth is actually spinning towards the Sun.

9

What actually happens when the Sun sets?

The Earth is actually spinning away from the Sun.

10

What is the Earth's shape?

Oblate spheroid.

11

What motion causes the Earth to take on the shape that it is?

Earth's rotation.

12

What force causes the Earth's mass to move outward from it's center at the equator as the Earth rotates on its axis?

Centrifugal force.

13

Where is the slight bulging of the Earth's circumference?

The equator.

14

Where is the slight squishing of the Earth's circumference?

The poles.

15

Which circumference is bigger the equator or the poles?

The equator.

16

What causes the seasons?

The tilt of the Earth on its axis as it revolves around the Sun. Tilt and Revolution.

17

Elliptic

The plane on which the Earth orbits around the Sun (23.5).

18

What causes summer in the Northern and Southern hemispheres?

When the hemisphere is tilted towards the Sun during the Earth's orbit.

19

What causes winter in the Northern and Southern hemispheres?

When the hemisphere is tilted away from the Sun during the Earth's orbit.

20

Why are the seasons opposite in the northern and southern hemispheres?

When one hemisphere is tilted towards the Sun, the other is tilted away from it.

21

At which month is the N. hemisphere closest to the Sun?

January (Winter)

22

At which month is the N. hemisphere farthest from the Sun?

July (Summer)

23

Perihelion

When the Earth is closest to the Sun.

24

Aphelion

When the Earth is farthest from the Sun.

25

Precession

Wobble in the Earth' rotational axis and happens every 26,000 years. Caused by the sideways pull of the Moon and the Sun on the Earth's bulging equator.

26

Nutation

A change in the angle of tilt of the Earth's axis. Takes 18 years to complete 1 cycle.

27

What causes tides?

The gravitational attraction among the Earth, Moon, and Sun.

28

Tides

Periodic rise and fall of sea level.

29

What motion causes the tides to change every 6 hours?

Gravitational pull.

30

What force causes the tides

Centrifugal swish.

31

Why do the times of the high and low tides at a particular location change each day?

The Moon orbiting the Earth every 28 days and the Earth's rotation on it's axis.

32

Spring Tide

2x a month. When the Earth, Moon, ad Sun align it causes the Moon and Sun to pull together on the Earth;s oceans. Higher high tides and lower low tides.

33

Neap Tide

2x a month. When the Earth, Moon, and Sun will form a right angle which causes the Moon and Sun to pull from different directions in the Earth's oceans. Evens the tides.