• defined the principle of the lever
  • first class lever (sissors)
  • second class lever (wheelbarrow)
  • third class lever (arm, bat)
• invented the compound pulley, spool and rope (elevator)
• invented the hydraulic screw, for raising water from a lower to a higher level
• discovered the law of hydrostatics, known as Archimedes' Principle
• evaluated pi by equating the circumference of a circle to fractions of its diameter (< 3 1/7 d and > 3 10/71 d; or about 3.14)
• discovered a mirror system that burned invader's boots & ships by focusing the sun's rays

1. Inertia
2. Acceleration
   
3. Action and Reaction

Newton's Law of Gravitation

• Any object or piece of matter, from the size of a planet to a pinhead, has an attracting or gravitational force.
• The gravitational force between two objects is proportional to the product of their masses.
• The gravitational force varies with the distance between the two objects (gravitational force of an object weakens quickly as the distance from it increases).
• Formula of gravity, F = Gm₁ m₂ r ²
  Where F is the gravitational force, G is the gravitational constant (a number that is always the same), m₁ and m₂ are the masses of the two objects, and r is the distance between them.