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Apologia Physics M5
Newton's Laws
Isaa | Answer |
---|---|
Isaac Newton | believed that in studying science, he was actually learning about God |
Aristotle | concluded that matter "wants" to be at rest, and it will stay at rest until acted on by some outside force (4th century BC) |
Galileo Galilei | began doing experiments in the late 1500s that contradicted Aristotle's view |
friction | a "hidden" force, when two surfaces come into contact with one another, the surfaces grab onto each other, resulting in a force that inhibits motion |
Since friction opposes motion, | it will reduce the speed of an object until that object stops. |
Law of Inertia | Newton's First Law - an object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force |
Newton's Second Law | When an object is acted on by one or more outside forces, the vector sum of those forces is equal to the mass of the object times the resulting acceleration vector. |
Sum F = ma | One of the most fundamental equations in all of physics |
force | a push or a pull exerted on an object in an effort to change that object's velocity |
We calculate force by | multiplying mass by acceleration. |
Newton | SI unit for force, defined as kg*m/sec2 (seconds squared) |
dyne | g*cm/sec2 (seconds squared) |
a gallon of water held in your hand pulls your hand down with a force of | 40 Newtons |
a fly landing on your finger pushing your finger down with a force of | 1,000 dynes |
If acceleration is a vector quantity, | force must be a vector quantity as well. |