Transcript Earth*s rotation

EARTH’S ROTATION
TEKS 5.8C
STUDENT OBJECTIVE
• 5.8C Earth and space. The student knows
that there are recognizable patterns in the
natural world and among the Sun, Earth, and
Moon system. The student is expected to
demonstrate that Earth rotates on its axis
once approximately every 24 hours causing
the day/night cycle and the apparent
movement of the Sun across the sky
ESSENTIAL QUESTION
•How can you show Earth rotating?
•What is the significance the day and
night cycle?
•Does the Sun move across the sky?
WARM-UP QUESTIONS
• WHAT DO YOU KNOW ABOUT THE EARTH’S
ROTATION?
• What is the day and night cycle?
• Does the Sun move or the Earth?
VOCABULARY
VOCABULARY
(WILL NEED TO KNOW IN
6TH GRADE)
ROTATION
What does Rotation mean?
Rotation occurs when something is spinning around an axis.
What are some examples of things that rotate?
Tops, Ballerinas, Figure skaters, cyclones, Tornadoes, a merry-go-round, Earth
How do we know that the Earth rotates?
1.
Star trails- trails made with time exposure, circular paths that occur because the
planet is moving and not stationary.
2.
Winds curve because of the Earth’s rotation.
3.
Ocean currents curve clockwise in the northern hemisphere, and counterclockwise
in the southern hemisphere.
4.
The movement of a pendulum. It does not actually move, it is the Earth moving
that causes the pendulum to appear to change the direction of its swing.
ROTATION
• WHAT IS ROTATION?
• WHAT IS AN AXIS?
PRACTICE ROTATING
• STAND UP
• HOLD YOUR LEFT HAND UP (THUMB EXTENDED)
• POINT TO THE LEFT
• TURN, TURN, TURN
• THIS IS HOW THE EARTH ROTATES (Spins)
NIGHT AND DAY
What causes night and day?
The rotation of the Earth
• The side of the Earth that is facing the sun has daylight, the side of the Earth away from the
sun has night.
• It takes 24 hours for the Earth to complete one rotation.
• The Earth is tilted on it’s axis at a 23.5 degree angle.
• The Earth’s tilt is always in the direction of the North Star.
What is another name for the North Star?
Polaris
• This tilt is what causes our days to get longer in the summer and shorter in the winter.
• Because of the Earth’s rotation the sun appears to rise in the east and set in the west.
• ***WRITE THIS RED SENTENCE IN YOUR JOURNAL****
PRACTICE – EXPERIENCE DAY AND NIGHT CYCLE
• TAPE North America (front of a person), TAPE Asia (Back of same Person)
• SLOWLY ROTATE (remember to use your left thumb as a guide)
• SHINE the FLASHLIGHT on the person (start with North America)
• ROTATE
• Where is daylight at?
• Where is night time at?
• Does it stay the same?
• THIS IS HOW THE EARTH EXPERIENCES DAY AND NIGHT
WEB BASED INTERACTIVE LESSON
• CLICK HERE FOR LESSON
• Study Jams
• http://studyjams.scholastic.com/studyjams/jams/science/solar-system/day-on-earth.htm
• As the Earth Turns
• http://www.beaconlearningcenter.com/WebLessons/AsTheEarthTurns/turn01.htm
• Sunset and Sunrise
• http://www.beaconlearningcenter.com/WebLessons/SunriseSunset/rise01.htm
TODAY’S EXPERIMENT
• SAFETY GLASSES?
• GATHER YOUR MATERIALS (ONE BLUE TRAY)
• IN ADDITION: LABQUEST AND LIGHT PROBE
• WHAT CAN YOU INFER YOUR EXPERIMENT WILL
BE FROM THESE MATERIALS?
SCIENTIFIC METHOD
REMEMBER TO USE YOUR STEPS
PROBLEM
•HOW CAN I
DEMONSTRATE THE
EARTH ROTATES ON IT’S
AXIS EVERY 24 HOURS?
HYPOTHESIS
• DISCUSS WITH YOUR GROUP WHAT
EXPERIMENT COULD YOU PERFORM WITH
THEM…..
•CREATE A HYPOTHESIS
TIME START AND TIME END
• Did you write your start time in your
journal?????
• Remember to record date, time and any other
important data as your are conducting your
experiment
EXPERIMENTAL PROCEDURE
• HOW ARE YOU GOING TO PERFORM YOUR
EXPERIMENT?
• **Hint: Ensure you use the labquest to record light
samples from your flashlight and from “behind” the Earth
•WRITE YOUR STEPS
CONDUCT, OBSERVE AND RECORD YOUR
EXPERIMENT FINDINGS
•CONDUCT THE EXPERIMENT
•OBSERVE
•RECORD YOUR OBSERVATIONS
CONCLUSIONS
•WAS YOUR HYPOTHESIS
CORRECT?
•WHY OR WHY NOT?
QUICK CHECK: SHOW WHAT YOU KNOW!!