Gravity
By: CJ Miske
What is gravity?
• Gravity is the force that causes two particles
to pull towards each other.
• The force of attraction by which terrestrial
bodies tend to fall toward the center of the
earth.
Founder of Gravitational Theory
• Sir Isaac Newton
Isaac Newton
• Newton’s life (January 4, 1643 –
March 31, 1727)
• Newton was an English physicist,
mathematician, astronomer,
natural philosopher, alchemist,
and theologian.
• Published “Mathematical
Principles of Natural Philosophy”
in 1687. (One of the most
important scientific books ever
written)
Gravitational Theory
• Newton's law of universal gravitation states
that every point mass in the universe attracts
every other point mass with a force that is
directly proportional to the product of their
masses and inversely proportional to the
square of the distance between them.
Could We Survive Without Gravity?
• Without gravity, the air in
the atmosphere has no
reason to hang around, and
it would immediately leap
into space.
• This is the problem the
moon has - the moon
doesn't have enough
gravity to keep an
atmosphere around it, so
it's in a near vacuum.
Without an atmosphere,
any living thing would die
immediately and anything
liquid would boil away into
space. Sooo… No!
What type of force is Gravity?
• Pull
So What Do We Know About Gravity?
• It causes any two objects in the universe to be
drawn to one another.
• Gravity assisted in forming the universe.
• It keeps the moon in orbit around the Earth,
Gravity and the Black Hole
• When gravity gets to extreme and
overwhelms all other forces in the universe, it
causes a black hole.
• Once inside, nothing can escape a black hole's
gravity — not even light.
Video
• http://www.youtube.com/watch?v=Arr5oihTm4
Works Cited
• "Newton's Law of Universal Gravitation." Wikipedia, the Free
Encyclopedia. Web. 09 Apr. 2011.
<http://en.wikipedia.org/wiki/Newton's_law_of_universal_gravitati
on>.
• "Gravity | Define Gravity at Dictionary.com." Dictionary.com | Free
Online Dictionary for English Definitions. Web. 09 Apr. 2011.
<http://dictionary.reference.com/browse/gravity>.
• "Answers.com - Who Is the Founder of the Law of Gravity."
WikiAnswers - The Q&A Wiki. Web. 09 Apr. 2011.
<http://wiki.answers.com/Q/Who_is_the_founder_of_the_law_of_
gravity>.
• http://science.howstuffworks.com/environmental/earth/geophysics
/what-if-zero-gravity1.htm