AS101 Lecture 10

AS101 Lecture 10 - AS101 Lecture 10 Logistics: Do not...

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Unformatted text preview: AS101 Lecture 10 Logistics: Do not forget Night Lab Homework 3 due today. Homework 4 available Last Lecture: Kepler Galileo Todays Lecture: Newton Isaac Newton (1642-1727) Greatest Scientist in History History Born middle class Educated in Oxford Fled the Plague in 1665 Reinvented the Universe by 1667 Major Inventions & Discoveries 3 Laws of Mechanics Calculus Law of Gravity Nature of white light Reflecting telescope Isaac Newton (1642 - 1727) Born Dec 25, 1642 (the year Galileo died - Gods Christmas gift to mankind) (January 4, 1643, by Gregorian calendar adopted in England in 1752) 1665/6: Discovered the Law of gravity, but very secretive - did not tell anyone for 20 years 1669: Became Lucasian Professor of Math at Cambridge Revolutionary text In 1687 Newton published Principia which included his universal law of gravitation and the three laws of motion http://www.library.usyd.edu.au/libraries/rare/modernity/newton5.html Newtons First Law of Mechanics In the absence of a net force, an object moves with constant velocity. Mathematically: If F =0 then v =constant where F is the force and v is the velocity. Objects travel in straight lines unless acted upon Friction is a force Principia Mathematica (original 1687 edition) Newtons first law of motion Galileo: an object's velocity can be changed only if a force acts on the object. Ren Descartes (1596 -1650): an infinite universe with no special or privileged place concept of inertia : a body at rest remains at rest, and one moving in a straight line maintains a constant speed and same direction unless it is deflected by a force. Newtons First law of motion (often called, the law of inertia ) is essentially a reiteration of this: In the absence of a net force, an object moves with constant velocity Net Force Any object may be subject to a number of forces These forces could combine or they could cancel each other The Net force describes the combined effect of all forces The essence of the First Law...
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AS101 Lecture 10 - AS101 Lecture 10 Logistics: Do not...

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