Lecture5

# Lecture5 - Lecture 5: Newton’s Laws ...

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Unformatted text preview: Lecture 5: Newton’s Laws  Ph 1a   October 13, 2010  Newton’s Laws  •  First Law: Every body con>nues in its state of rest, or of  uniform mo>on in a straight line, unless it is compelled  to change that state  by forces impressed upon it  •  Second Law: The change of mo>on of an object is  propor>onal to the force impressed; and is made in the  direc>on of the straight line in which the force is  impressed.  •  Third Law: To every ac>on there is always opposed an  equal reac>on; or, the mutual ac>ons of two bodies  upon each other are always equal, and directed to  contrary parts.  Transla>on  •  First Law:   •  Second Law:   •  Third Law:   a = 0 if F = 0 F = ma F12 = −F21 F •  Student: what is      ? How do I calculate it ?  •  Physicist: It might be weak, or strong; perhaps electric or  magne>c; some>mes aOrac>ve and some>mes repulsive;  or a maOer of gravity  –  In other words: I wish I knew….  –  Our knowledge of forces at a fundamental level is incomplete  –   Gravity + E&M are enough for most prac>cal problems  ...
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## This note was uploaded on 02/22/2011 for the course PH 1a taught by Professor Goodstein during the Fall '07 term at Caltech.

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