1. The Contributions of Sir Isaac Newton Compare effects of gravitational force on Earth, on the moon and within space. Identify contributions of Newton to the study of gravityIdentify contributions of Newton to the study of gravity Describe how a spring scale is used to measure weightDescribe how a spring scale is used to measure weight Explain how air resistance affects falling objectsExplain how air resistance affects falling objects http://en.wikipedia.org/wiki/Image:GodfreyKneller-IsaacNewton-1689.jpg

2. A popular story claims that Newton was inspired to formulate his theory of universal gravitation by the fall of an apple from a tree. A reputed descendant of Newton's apple tree, found in the Botanic Gardens in Cambridge. http://en.wikipedia.org/wiki/Image:NewSolarSystem2.jpg

3. The question was not whether gravity existed, but whether it extended so far from Earth that it could also be the force holding the moon in its orbit. http://en.wikipedia.org/wiki/Image:NewSolarSystem2.jpg

4. He used the Latin word gravitas (weight) for the force that would become known as gravity. Gravitation keeps the planets in orbit about the Sun. http://en.wikipedia.org/wiki/Image:Solar_sys8.jpg

5. Newton developed three famous laws of motion…

6.  Newton's First Law (also known as the Law of Inertia) states that an object at rest tends to stay at rest and that an object in uniform motion tends to stay in uniform motion unless acted upon by a net external force.  Essentially this means that an object that is not moving will not move until a force acts upon it.

7.  Newton's Second Law says that the rate of change of momentum of an object is directly proportional to the force acting on the object.  Essentially this means that the rate of change of the momentum of a body is the same size as the resultant force acting on the body and is in the same direction.

8.  Newton's Third Law states that for every action there is an equal and opposite reaction.  This law of motion is commonly paraphrased as: "To every action force there is an equal, but opposite, reaction force".