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Created February 13, 2012 19:14
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Newton's First Law of Motion
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<!--Xholon Workbook (C) Ken Webb Mon Feb 13 2012 14:14:40 GMT-0500 (EST)-->
Khan Academy
Title: Newton's First Law of Motion
Description: Newton's First Law (Galileo's Law of Inertia).
InternalName: newton-s-first-law-of-motion
YoutubeId: CQYELiTtUs8
Keywords: motion, rest, physics, kinematics
My Notes
"Every body persists in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed"
- Newton's restatement of Galileo's law of inertia
part a (at rest)
- a Rock at rest, on a field of grass, will not move
- a block of Ice on an area of Ice
- unbalanced force; two unequal forces pushing in opposite directions
part b (moving uniformly)
- a Ball in motion through the air
- ice will stop eventually because of friction, and air resistance
- ball will also stop because of air and ground friction, and because of gravity
- planets in motion don't stop because there's no friction
- airplane at constant velocity; passenger can't tell if the plane is moving
- from my frame of reference
There are no specific problems or numbers used in this video, so there's nothing specific to model. It's just an intro to the theory.
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