ROTATION VS. REVOLUTION GRADE 6 SCIENCE

ROTATION VS. REVOLUTION

1. Classroom Standards; Be kind, polite, respectful and courteous to others. Cooperate actively in the class discussion. Listen to the teacher and classmates, and follow directions. Work hard and always do your best. Raise your hand when you like to speak in the class, when leaving your seat or if you need to leave the classroom for a reason .

2. MOTIVATION

3. The Earth is made of rocks, soil, water, and air. It is one of the planets that spins and travels around the Sun. The Earth is a very tiny part of the universe, but home to many forms of life. The Earth moves at a constant speed. It follows a counterclockwise direction. The Earth moves in three ways; it rotates and travels around the Sun, and moves through the Milky Way galaxy with the rest of the planets in the Solar System.

4. Rotation Every day the Sun appears to rise in the east, travel across the sky, and set in the west. You can observe this day in and day out. But the Sun does not move from east to west. Instead, the Earth is spinning on its axis at a regular and steady rate once every 24 hours or 1 whole day. This movement of Earth on its axis is called rotation .

5. Look at Figure on the left as the Earth is represented by a globe. A globe is a spherical model of Earth. In this figure, you will see that the Earth rotates on its axis counterclockwise and that spinning of Earth on its axis is the Earth’s motion called rotation. One complete rotation of the Earth makes up a one complete day with day and night happening within 24 hours.

6. Effects of Earth’s Rotation: Day and Night The Sun is the closest star to Earth. The sun seems to rise in the east and set in the west. The apparent movement of the Sun is due to the direction of Earth’s rotation. This rotation of Earth causes day and night.

7. Look at Figure , this time the illustration shows the sunlight ( as represented by the arrows in the figure ) receives by the Earth on some of its parts making it daytime for these parts facing the Sun. On the other hand, the figure also shows that as the Earth rotates, the other side of the Earth do not receive sunlight making it nighttime on these parts of the Earth that are not receiving direct sunlight.

8. REVOLUTION The second motion of the Earth is that it travels around the Sun in space. This movement of Earth around the Sun is called revolution . The Earth revolves around the Sun in a counterclockwise direction. It takes the Earth one year or 365 ¼ days to revolve around the Sun. The Gregorian calendar we presently use has only 365 days in a year. So, to compensate for the excess time and to keep the calendar in sync with the revolution of the Earth, a leap year is used for every four years. A leap year adds one day to the end of February once every fourth year to complete the 365 and ¼ days.

9. In Figure 3 , the arrows show the motion of Earth as it revolves around the Sun through its orbit , Earth’s orbit is an elliptical path space where it takes around the Sun. This motion is called revolution .

10. Effects of Earth’s Revolution: Four Seasons It takes 365 ¼ days or one year for Earth to complete one revolution around the Sun. In some countries, this movement of the Earth causes four (4) seasons namely summer , autumn , winter , and spring . Different parts of the Earth have different seasons all throughout the year because of the Earth’s revolution and the tilt of its axis. The Earth tilts at 23.5 degrees. As the Earth moves around the Sun, the Earth’s axis is always tilted in the same direction throughout its orbit. As a result, different parts of the Earth receive different amounts of sunlight at different times of the year.

11. ACTIVITY 1 CROSS WORD PUZZLE

12. ACTIVITY 2 GROUPINGS

13. Read the standards for simple science activity. Work with the group cooperatively. Listen and understand the directions of your leader. Perform your group activity orderly . Be ready to present your collaborative output.

14. GROUP 1 The first group will draw a diagram of rotating Earth and explain why the Earth has day and night.

15. GROUP 2 The second group will draw a diagram of revolving Earth around the sun and explain the sequences of seasons. Use arrow to represent the direction of its movement.

16. GROUP 3 For the last group you will list at least f ive ( 5 ) possible things that could happen if the Earth would stop rotating.

17. Rubrics in Assessing Group Performance in Simple Science Activity

18. EVALUATION 1. Which statement about Earth's rotation and its revolution is correct? A . It takes Earth longer to rotate on its axis than revolve around the Sun. B . It takes Earth longer revolve around the Sun than to rotate on its axis. C . It takes Earth longer to rotate around the Sun than revolve on its axis. D. It takes Earth longer revolve around the Sun than to revolve on its axis .

19. 2. What causes the apparent movement of the Sun across the sky during the day on Earth? A . Location of Earth in space B . Rotation of Earth on its axis C. Revolution of Earth in its orbit D. Objects are moving around the Earth

20. 3. How long does it take for Earth to rotate once on its axis? A. 1-day B. 1-year C. 1-week D . 1 month

21. 3. How long does it take for Earth to rotate once on its axis? A. 1-day B. 1-year C. 1-week D . 1 month

22. 4. Which best explains why Earth has day and night? A. Earth rotates on an axis B . The moon rotates on an axis C . Earth revolves around the Sun D . Earth revolves around the Sun

23. 5. The Earth is tilted _____ degrees from the right –angled position. A. 21 ½ B. 22 ½ C. 23 ½ D. 24 6. When the Northern Hemisphere is tilted toward the Sun, the Southern Hemisphere is experiencing ________. A. Autumn B. Summer C. Winter D. Spring

24. 7. It is a time of a year when the length of daytime and nighttime is equal. A. Winter solstice B. Summer solstice C . Equinox D. Axis 8. In a leap year, February has how many days? A. 27 B. 28 C. 29 D. 30

25. 9. Which term describes the movement of the Earth around the sun? A. Rotation B. Revolution C. Spinning D. Precession 10. How long does it take for the Earth to go one complete revolution around its orbit?

26. “Rotation Song” by Mr. Parr.

27. THANK YOU 