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Movements of the Earth: Gravity, Inertia, Rotation, Revolution

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Movements of the Earth: Gravity, Inertia, Rotation, Revolution By: Brianna Shields January 17, 2005 DO NOW 1. Which of the 9 planets is the hottest? – PowerPoint PPT presentation

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Title: Movements of the Earth: Gravity, Inertia, Rotation, Revolution


1
Movements of the Earth Gravity, Inertia,
Rotation, Revolution
  • By
  • Brianna Shields
  • January 17, 2005

2
DO NOW
  • 1. Which of the 9 planets is the hottest?
  • 2. What type of object in outerspace is a huge
    chunk of rock or metal that orbits the sun?
  • 3. What type of force allows planets to continue
    orbiting the sun?

3
GOAL
  • To be aware of the patterns and effect of motion
    in the universe and the forces relative to said
    motion

4
Gravity
  • Gravity
  • 1. Pulling force that attracts objects
  • 2. Pulls things down on Earth

5
Gravity
  • 3. Every object has gravity
  • 4. Strength depends on mass distance between
    objects
  • Gravity

Less Gravity
More Gravity
6
Gravity
  • Gravity

Less gravitational pull
More gravitational pull
7
  • A space station is to be located between the
    Earth and the Moon at the place where the Earths
    gravitational pull is equal to the Moons
    gravitational pull. Which of these locations
    would be best? Explain

a
b
c
8
Gravity
  • What does gravity do?
  • 1. Holds planets in paths around sun

9
Gravity
  • What does gravity do?
  • 2. Keeps moon in its orbit around the Earth

10
Gravity
  • What does gravity do?
  • 3. Keeps entire universe moving in an orderly
    way

11
Inertia
  • Inertia
  • 1. Every object in universe is moving

12
Inertia
  • Inertia
  • 2. A body in motion stays in motion
  • 3. A body at rest stays at rest
  • 4. Unless acted on by a force

13
Inertia
  • Inertia
  • 5. Every object tries to stay the way it is
  • Either moving or resting

14
Inertia
  • 1. Moon to keep moving around Earth
  • 2. Planets to keep orbiting the sun
  • What does inertia cause in space?

15
Inertia
  • What does inertia cause in space?
  • 3. Galaxies to keep moving through space

16
Other forces
  • Air Resistance
  • 1. Slows down moving objects on Earth (object
    rubs against air)

17
Other forces
  • 2. No air or gravitational attraction in space
  • Air Resistance in Space

18
Assessment
  • Draw a picture of the earth- draw in arrows
    showing where gravity and inertia are acting

INERTIA
GRAVITY
19
Assessment
  • Which of these 2 objects has more gravitational
    pull? Explain

20
Assessment
  • How could you decrease the amount of
    gravitational pull between these two objects?

21
Assessment
  • Explain how this animation represents inertia?

22
Assessment
  • What role does inertia play in outer space (list
    2 things it causes)?

23
Assessment
  • What role does gravity play in outer space (list
    2 things it causes)?

24
Assessment
  • What could happen to Earth if either gravity or
    inertia were removed from the sun or the Earth?

25
Assessment
  • If the sun has so much gravity, why doesnt it
    suck the planets in?

26
EARTH
  • Parts of the Earth
  • 1. Equator- horizontal line dividing north and
    south hemispheres

27
EARTH
  • Parts of the Earth
  • 2. Latitude- horizontal lines
  • 3. Longitude- vertical lines

28
EARTH
  • Parts of the Earth
  • 4. Hemispheres- N S, E W

29
EARTH
  • Parts of the Earth
  • 5. Earths axis is tilted 23.5 degrees

30
Diagram of the Earth
  • Without using your notes, draw a diagram of the
    Earth
  • Label
  • Equator
  • Latitude
  • Longitude
  • Each Hemisphere
  • Earths tilt

31
EARTHS MOVEMENTS
  • Earths movements
  • 1. Rotation- spins like a top
  • 2. Revolution- moves around sun (30km/sec) in
    oval path

32
EARTHS MOVEMENTS
  • ROTATION
  • 1. Earth spins on its axis
  • 2. 24 hours one rotation
  • 3. Causes night and day
  • 4. Side of Earth facing sun has day

33
Day vs. Night
34
EARTHS MOVEMENTS
  • REVOLUTION
  • 1. Earth goes around sun (orbits)
  • 2. Takes 1 year 365 1/4 days
  • 3. Causes seasons
  • 4. Hemisphere tilted toward sun has summer

35
EARTHS REVOLUTION
  • SEASONS
  • 1. Summer, Fall, Winter, Spring

36
EARTHS REVOLUTION
  • SEASONS
  • 2. When north hemisphere is tilted toward sun
    summer
  • More direct, intense light rays, warm Earth more

37
EARTHS REVOLUTION
  • SEASONS
  • 3. When north hemisphere is tilted away sun
    winter
  • Weaker, spread out light rays, warm Earth less

38
EARTHS REVOLUTION
  • SEASONS
  • 4. When n. hemi has winter, s. hemi has summer

39
EARTHS REVOLUTION
  • SEASONS
  • 5. Spring and Fall occur when neither hemisphere
    is tilted toward or away from the sun
  • Equinoxes

40
EARTHS REVOLUTION
  • STRANGE SEASONS
  • 1. Equator always direct sunlight
  • Summer year round
  • 12 hrs daylight, 12 hrs nighttime

41
EARTHS REVOLUTION
  • STRANGE SEASONS
  • 2. Poles- short summers, long winters
  • A day of 24 hours of light
  • A day of 24 hours of darkness

42
Diagram of Earths Seasons
  • Draw a diagram of the sun.
  • Draw 4 Earths, where summer, winter, spring and
    fall would occur
  • Make sure you show which way the earth is tilted
    for each
  • Label each Earth with the season

43
Diagram of Earths Seasons
44
Diagram of Earths Seasons
45
Diagram of Earths Seasons
46
ASSESSMENT
  • What do we call this movement of the Earth?
  • How long does it take?
  • What does it cause?

47
ASSESSMENT
  • What do we call this movement of the Earth?
  • How long does it take?
  • What does it cause?

48
ASSESSMENT
  • Which part of the Earth is having night?
  • What season is the northern hemisphere having?
  • Southern hemisphere?

49
ASSESSMENT
  • In which direction does the sun rotate?
    (clockwise or counterclockwise)

50
ASSESSMENT
  • Explain where each of the seasons are occurring
    for the southern hemisphere!

51
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