Earth's rotation

Classroom rules

Let's watch!

Open Ended

What can you say about the world's culture?

Greeting with a twist!

Greet good morning/ night your classmates using the language of the world

Poll

How did you feel greeting your classmates using a foreign language?

• awkward

• quite feeling shy

• it was a lot of fun!

Language is one of the most important parts of any culture. 

Open Ended

What else rotates?

EARTH'S ROTATION

Lesson objectives:

1. Describe the effects of Earth’s rotation.

2. Start developing a short documentary video relevant for this week’s lesson. 

3. Identify ways on how to promote respect to each and everyone’s culture and tradition.

Multiple Choice

● Why does the sun rise at the east and set at the west?

• Because of earth's rotation

• Sun moves from east to west

The sun does not move from east to west

It's actually because of the earth's rotation.

Multiple Choice

● How does our planet rotate?

• spins on its axis

• orbits around the sun

• slides through the outer space

Rotation

The movement of the Earth on its axis

Multiple Choice

How long does it take for the earth to complete one rotation?

• 1 day

• 365 1/4 days

1 Rotation period

= 1 day

Earth is tilted while spinning on its on axis.

The direction of rotation is from west to east or counterclockwise.

Multiple Choice

Why is the earth tilted?

• The sun has a powerful gravity that keeps pulling the planet towards it.

• It collided with a another proto-planet and in the process it was tilted.

Tilted Earth

The main consensus is that it has to do with Earth’s formation along with the rest of the planets in the Solar system.

It looks like it probably collided with a another proto-planet and in the process it was tilted.

Multiple Choice

● At what angle is the earth tilted?

• 22.5°

• 23.5°

Earth 101

The Earth rotates around its axis at a rate of about 1,600 kilometers (1,000 miles) an hour.

Thoughts to Ponder:

Why can't we feel that the Earth is rotating?

https://www.youtube.com/watch?v=0H7NLiaeIWQ

Open Ended

Why can't we feel that the earth is rotating?

The world is round and we turn around!

1. rotate normally

2. rotate faster

3. rotate slowly

Poll

Which rotation did you feel perfectly fine?

• fast rotation

• slow rotation

• normal rotation

Effects of the Earth's rotation

Day and Night

Earth rotating on its axis is the reason behind days and nights every 24 hours. 

Poll

Are you a night owl or an early bird kind of person?

• Night owl

• Early bird

https://www.youtube.com/watch?v=xerrjjAyZs8&t=92s

Open Ended

What ways can you do to show respect to someone's culture and tradition?

Tides

Rotation causes tides, i.e. rise and fall of the sea level twice a day.

The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. These bulges of water are high tides.

What Causes Tides? | NOAA SciJinks – All About Weather

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Shape of the Earth

The speed of the Earth’s rotation has affected the shape of the Earth. Because of the speed of rotation, a centrifugal force is created which leads to the flattening of the Earth at poles and bulging at the center.

Multiple Choice

What is earth's shape?

• oblique spheroid

• oblate spheroid

Wind system: Coriolis effect

When the earth rotates on its axis, wind cannot move in a straight line toward north and south from the equator.

A Coriolis force is generated. Under its influence, winds deflect to their right in the northern hemisphere and to their left in the southern hemisphere. 

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Movement of the stars

The stars appear to move very slowly because of the earth's rotation.

The moving stars

https://www.youtube.com/watch?v=HsJxGpDmJrQ

Open Ended

There is one star that does not appear to move.

Clue: This star tells us where the north is.

POLARIS

Also called as the northern star. It points directly above the earth's axis

Sailors using stars to navigate it's way

Open Ended

New things learned:

Describe the the effects of earth's rotation