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Gravity
Gravity is the idea that two (or more) chunks of matter tend to attract to each other. The more mass they have, the more they will
attract.
Galileo Galilei (1564-1642)
- Used the telescope to revolutionize our understanding of the Universe
- Discovered that all masses regardless of size fall at the same rate when dropped from
the same height.
Isaac Newton (1642-1727)
- Worked out laws of motion and gravity, revolutionized our understanding of the
world.
- Orbits of planets and satellites are based on Newton's laws!
- Newton's Laws:
- A body at rest or moving in a straight line at a constant speed stays that
way unless a force is applied to it.
- A body's mass times its acceleration is equal to the applied force
(F=Ma).
- To every action there is always opposed an equal reaction.
- Newton's Universal Law of Gravitation:
The force of gravity between two bodies is directly proportional to the product of their
masses and inversely proportional to the square of the distance between them.
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