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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
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There is an
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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
WEIGHT
 Mass is a physical property
of matter that explains how
much matter is in an object
 Mass does not change when
gravity changes
 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