1) What is the name of the law about gravity? The law of…A) …Conservation of Mass or B) …universal Gravitation

(2) All matter in the universe attracts other matter by? A) A “pushing force” or B) A “pulling force”

(3) The amount of gravity depends on the _______ of the objectsA) Shape or B) Masses

4) Effect of gravity depends on the _____ between the objects.A) Planets or B) Distance

5) What did Einstein say about mass and gravity?A) That mass warps space or B) Mass and gravity are the same

SPI 0807.12.5 to 12.6Gravity

Bellwork Jan 8, 2013

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PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO

ADVANCE THROUGH THE

SLIDES!

1) What is the name of the law about gravity? The law of…B) …universal gravitation

2) All matter in the universe attracts other matter by? B) A “pulling force”

3) The amount of gravity depends on the _______ of the objectsB) Masses

4) Effect of gravity depends on the _____ between the objects.B) Distance

5) What did Einstein say about mass and gravity?A) That mass warps space

SPI 0807.12.5 to 12.6Gravity

Bellwork

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1) Look at the two diagrams below. In the 1st diagram two soccer balls are 5m apart. In the 2nd diagram two soccer balls are 8m apart. In which diagram is the gravitational attraction greatest and why?

Diagram 01

Diagram 02

SPI 0807.12.5 to 12.6Gravity

Notes

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5 meters

8 meters

WHY?: Because the effect of gravity is greater when objects are closer together

Newton discovered the 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)(2)How Gravity Really Works

Demonstration:Use a sheet and a soccer ball to demonstrate how gravity wraps the fabric of space

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Notes

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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