copyright © 2011 interactivesciencelessons.com™ sun 8 planets their 167 moons 3 dwarf planets...
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Copyright © 2011 InteractiveScienceLessons.com™
•Sun•8 planets•their 167 moons•3 dwarf planets•Asteroids•Comets•Dust
Copyright © 2011 InteractiveScienceLessons.com™
CentimetersMillimeters
inchesX
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10 mm20 mm13 mmmm
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1.
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9.
Number from 1-9 on a clean sheet of paper
Measure the length of your paper __mm
Measure the width of your paper __mm
Line 1 x line 2 = total area __mm2
Measure the diameter of a hole __mm
πr2 to get area of circle __mm2
x 3 (3 holes) __mm2
Line 3 - line 6 __mm2
Line 7 X .0014 __mm2
√ of line 8 *__mm
*draw a box with sides this long near the middle hole of your paper
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•The area this sheet of paper takes up represents all the mass in our solar system
•The sun’s mass is all but this square•In this square is the combined mass of the planets, their moons, and everything else
•Jupiter and Saturn take up 90% of this box!
And so GRAVITY…
1. is the force of attraction between 2 objects
2. causes bodies to revolve around each other
3. increases with mass and closeness
Every object exerts a gravitational force on every other object!
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Common Examples• If you throw a ball into the air, it comes back
down• When you lose your balance on a ladder and fall• When you weigh yourself on a scale• Rain falling to earth…• Which turns into creeks, streams, then rivers, all
flowing downhill• People on the other side of the earth are
standing in the opposite direction that you are• The earth “holding onto” its atmosphere • The moon is tugging on you and me right now• Stars, though trillions of miles apart, stay
together in clusters
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This is a gravity switch. What
would happen if gravity was
switched “off”?
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