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Gravity
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GRAVITY DEFINED
 Gravity is the tendency of objects with
mass to accelerate towards each other
 Gravity is one of the four fundamental
forces (interactions) in nature.
Gravity and our Solar System
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 The Sun’s gravity is what holds our solar
system together.
Planets and
Gravity
 Since Jupiter is the
largest planet, it has
the most gravity.
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 Pluto has the least
amount of gravity of
all the planets
THE HISTORY OF GRAVITY
Sir Isaac Newton
theorized the
Law of Gravitation in
1687
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UNIVERSAL LAW OF
GRAVITATION
There is an
apple
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Gravity is greater when mass is larger
and distance is shorter.
MICROGRAVITY
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 The further an object is away from another object, the force of
gravity is weaker.
 The further an object moves from the surface of the Earth, the
less gravity it feels from the Earth.
 Scientists on the Space Shuttle experience microgravity
Mass and Weight are two
different Properties of Matter
MASS
 Mass is a physical property
of matter that explains how
much matter is in an object
 Mass does not change when
gravity changes
WEIGHT
 Weight is a force which is
calculated by multiplying the
acceleration of gravity times
mass.
 Weight can change when
gravity changes
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MASS
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

IF YOU PULLED A MOUSE AND AN ELEPHANT WITH THE SAME
AMOUNT OF FORCE, THE ELEPHANT WOULD RESPOND LESS TO
PULLING EVEN IF HE DIDN’T PULL BACK AT ALL
THAT IS BECAUSE AN ELEPHANT HAS MORE MASS THAN A
MOUSE
WEIGHT
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 An elephant on the Earth would weigh less on the
Moon, because gravity is less on the moon.
 An elephant’s mass would not change if he went to
the moon
Video demo
 Bill Nye
Wrap Up
-Gravity is one of the four fundamental forces
(interactions) in nature.
-The Sun’s gravity is what holds our solar
system together.
-Gravity is greater when mass is larger
and distance is shorter.
-Mass and Weight are not the same thing
Works Cited
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Doodle, Frances. "Gravity - Science for Kids!" Kidipede - History for
Kids - Homework Help for Middle School. 28 Sept. 2006. Web. 02 Mar.
2011.
<http://www.historyforkids.org/scienceforkids/physics/space/gravity.htm
>.
Jackson, Carl. "HowStuffWorks "How Does Gravity Work?""
Howstuffworks "Science" 11 July 2004. Web. 02 Mar. 2011.
<http://science.howstuffworks.com/environmental/earth/geophysics/que
stion232.htm>.
Luiss, Brandon. "Gravitation." Wikipedia, the Free Encyclopedia. 12
Mar. 2001. Web. 02 Mar. 2011.
<http://en.wikipedia.org/wiki/Gravitation>.
Siegfried, Tom. "A New View Of Gravity." Science News. Mar.-Apr.
2006. Web. 02 Mar. 2011.
<http://www.sciencenews.org/view/feature/id/63190/title/A_New_View_
of_Gravity>.