Copy down the following and fill in the blanks(Use page 521 in your book to help you)

The Law of Universal GravitationAll objects in the universe attracteach other by a__________ called __________. The amount of the __________ depends on the __________ of the objects and the ___________ between the objects.

SPI 0807.12.5 to 12.6Gravity

Bellwork Jan 7, 2012

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PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO

ADVANCE THROUGH THE

SLIDES!

Copy down the following and fill in the blanks(Use page 521 in your book to help you)

The Law of Universal GravitationAll objects in the universe attracteach other by a ______ called ________.

The amount of the ______ depends on the _______ of the objects andthe ________ between the objects.

SPI 0807.12.5 to 12.6GravityBellwork

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force gravity

forcemassesdistance

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)(2) Link: Birth of Our Solar System (2 min 16 sec)(3)Link: Planetary Formation (3 min 21 sec)

SPI 0807.12.5 to 12.6Gravity

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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 12.6Gravity

Show A Youtube video: (1)Link: Curvature of Space Time (34 sec)

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Notes

1) What is the name of the law about gravity?A) Law of Universal GravitationB) 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) GravityB) Electricity

SPI 0807.12.5 to 12.6GravityReview

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4) The amount of gravity depends on the _______ of the objectsA) ShapeB) Masses 5) The amount of gravity depends on the _________ between the objects.A) PlanetsB) Distance6) What did Einstein say about mass and gravity?A) That mass warps spaceB) That mass and gravity are the same

SPI 0807.12.5 to 12.6GravityReview

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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

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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

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1) What is one way gravity helped form our solar system and planets?

A) By pulling matter together B) By pushing matter apart2) 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 lines3) Contrast revolution and rotationA) Revolve=moving around another object,

Rotate=spinning on an axisB) Revolving is faster than rotation and has more gravity

SPI 0807.12.5 to 12.6GravityReview

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