It

1
Its Gravity

• History of Gravity

2
Early Ideas

• Ideas about gravity originated from everyday
  experience.
• Objects fall unless they are supported.

3
Ancient Greeks Aristotle

• Aristotle felt the cause of falling was
  heavinessthe heavier an object, the faster it
  falls.

4
Middle Ages

• During this period, the teachings of Aristotle,
  which were approved by the Church, were regarded
  as true and were basically unquestioned.

5
Renaissance Galileo

• Objects of differentweight fall at the same
  speed

6
Enlightenment Newton

• Gravity is not just about falling, it is about
  attractionall objects pull on all other objects!

7
Post Enlightenment 1700s, 1800s

• The theory of gravitation stayed essentially
  unchanged during this period.

8
Twentieth Century Einstein

• Objects don't feel a force of gravity, they
  simply move in straight lines but space itself
  is bent by the presence of matter.

9
Its Gravity

• Gravity pulls things together.
• Gravity does not end outside of the earth's
  atmosphere.
• The closer the objects the stronger the pullof
  gravity.