Download presentation
Presentation is loading. Please wait.
1
Movements of the Earth: Gravity, Inertia, Rotation, Revolution
2
Gravity Gravity 1. Pulling force that attracts objects
2. Pulls things down on Earth
3
Gravity Less Gravity More Gravity 3. Every object has gravity Gravity
4. Strength depends on mass & distance between objects Gravity Less Gravity More Gravity
4
Gravity Gravity Less gravitational pull More gravitational pull
5
A space station is to be located between the Earth and the Moon at the place where the Earth’s gravitational pull is equal to the Moon’s gravitational pull. Which of these locations would be best? Explain a b c
6
Gravity What does gravity do? 1. Holds planets in paths around sun
7
Gravity What does gravity do?
2. Keeps moon in its orbit around the Earth
8
Gravity What does gravity do?
3. Keeps entire universe moving in an orderly way
9
Inertia Inertia 1. Every object in universe is moving
10
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
11
Inertia Inertia 5. Every object tries to stay the way it is
Either moving or resting
12
Inertia 1. Moon to keep moving around Earth
2. Planets to keep orbiting the sun What does inertia cause in space?
13
Inertia What does inertia cause in space?
3. Galaxies to keep moving through space
14
EARTH Parts of the Earth
1. Equator- horizontal line dividing north and south hemispheres
15
EARTH Parts of the Earth 2. Latitude- horizontal lines
3. Longitude- vertical lines
16
EARTH Parts of the Earth 4. Hemispheres- N & S, E & W
17
EARTH Parts of the Earth 5. Earth’s axis is tilted 23.5 degrees
18
EARTH’S MOVEMENTS Earth’s movements 1. Rotation- spins like a top
2. Revolution- moves around sun (30km/sec) in oval path
19
EARTH’S MOVEMENTS ROTATION 1. Earth spins on its axis
hours= one rotation 3. Causes night and day 4. Side of Earth facing sun has day
20
EARTH’S 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
21
EARTH’S REVOLUTION SEASONS
2. When north hemisphere is tilted toward sun = summer More direct, intense light rays, warm Earth more
22
EARTH’S REVOLUTION SEASONS
3. When north hemisphere is tilted away sun = winter Weaker, spread out light rays, warm Earth less
23
EARTH’S REVOLUTION SEASONS
4. When n. hemi has winter, s. hemi has summer
24
EARTH’S REVOLUTION SEASONS
5. Spring and Fall occur when neither hemisphere is tilted toward or away from the sun Equinoxes
25
Diagram of Earth’s Seasons
Similar presentations
