2. Copy down the following and fill in the blanks (Use page 521 in your book to help you) The Law of Universal Gravitation All objects in the universe attract each other by a__________ called __________. The amount of the __________ depends on the __________ of the objects and the ___________ between the objects. SPI 0807.12.5 to 12.6 Gravity Bellwork Jan 7, 2012 1 PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE SLIDES!

3. Copy down the following and fill in the blanks (Use page 521 in your book to help you) The Law of Universal Gravitation All objects in the universe attract each other by a ______ called ________. The amount of the ______ depends on the _______ of the objects and the ________ between the objects. SPI 0807.12.5 to 12.6 Gravity Bellwork 2 force gravity force masses distance

4. Notes Gravity: is the force of attraction that makes objects move toward each other Mass and gravity: the greater the mass of an object the greater the amount of gravity The Nebular theory: states that our solar system (sun, planets, moons, comets, etc.) was formed by the effect of gravity upon a huge cloud of cosmic dust Show 3 YouTube videos: (1)Link: Formation of the Solar System (1 min 51 sec)Link: Formation of the Solar System (1 min 51 sec) (2) Link: Birth of Our Solar System (2 min 16 sec)Link: Birth of Our Solar System (2 min 16 sec) (3)Link: Planetary Formation (3 min 21 sec)Link: Planetary Formation (3 min 21 sec) SPI 0807.12.5 to 12.6 Gravity 3

5. Newton discovered the law of universal gravitation.  States that objects with more mass have stronger gravity.  Also states that gravity’s effect increases or decreases based on how close or how far apart two objects are from each other. (See Holt Online Ch15: Sect 4 Visual Concepts)  VC about law of universal gravitation Einstein theorized that mass warps/bends/curves space and this warping explains the force we call gravity SPI 0807.12.5 to 12.6 Gravity Show A Youtube video: (1)Link: Curvature of Space Time (34 sec)Link: Curvature of Space Time (34 sec) 4 Notes

6. 1) What is the name of the law about gravity? A) Law of Universal Gravitation B) Law of Conservation of Mass (2) All matter in the universe attracts other matter by? A) A “pulling force” B) A “pushing force” (3) This force is called _______? A) Gravity B) Electricity SPI 0807.12.5 to 12.6 Gravity Review 5

7. 4) The amount of gravity depends on the _______ of the objects A) Shape B) Masses 5) The amount of gravity depends on the _________ between the objects. A) Planets B) Distance 6) What did Einstein say about mass and gravity? A) That mass warps space B) That mass and gravity are the same SPI 0807.12.5 to 12.6 Gravity Review 6

8. Earth’s Rotation and Revolution Gravity causes our planet to rotate on its own axis Gravity keeps our planet (and all the other planets) from “flying off” into space as it revolves (orbits) around the sun (Do demonstration of rotation vs. revolution) Notes SPI 0807.12.5 to 12.6 Gravity 7

9. Gravity and the Motion of the Moon Gravity keeps the moon from “flying off” as it revolves (orbits) the Earth (See Holt Online Ch15: Sect 4 Visual Concepts)  VC about gravity and orbits SPI 0807.12.5 to 12.6 Gravity Notes 8

10. 1) What is one way gravity helped form our solar system and planets? A) By pulling matter together B) By pushing matter apart 2) What is another way gravity helped form our solar system and planets? A) By making objects revolve and rotate B) By making objects move in straight lines 3) Contrast revolution and rotation A) Revolve=moving around another object, Rotate=spinning on an axis B) Revolving is faster than rotation and has more gravity SPI 0807.12.5 to 12.6 Gravity Review 9