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Lecture_4

# Lecture_4 - PHYS 218 General Physics Fall 2012 >[email protected]#B >...

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Fall 2012 PHYS 218: General Physics !"#\$%&" () *+,-\$"& ./01 ./21 ./. 34&#"5 ,67 84946 :6 ;6" <:="65:46 >&4?/ @4A9#B >+C5:#5 D=/ 00( 8E F).GH0G)2G

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Displacement and Velocity An object ! s change in position is its displacement – Displacement: ! x = x final - x initial Average velocity is the displacement per unit time: v ave = x final ! x initial t final ! t initial = x 2 ! x 1 t 2 ! t 1 = " x " t I"#946 2/2
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Inertia and Mass Inertia is a measure of an object ! s resistance to changes in its motion This resistance to change depends only the object ! s mass – The mass of an object is a measure of the amount of matter it contains SI unit of mass is kg Mass is an intrinsic property of an object – It is independent of the object ! s location – It is independent of the object ! s velocity or acceleration – Independent of it’s composition or any other property I"#946 2/(
Newton ! s Second Law Multiple forces act on an object simultaneously The total force on the object is the sum of these individual forces, The acceleration of an object with mass m is then given by: – Newton ! s Second Law is the link between force and motion It tells us how an object will move when acted upon by a force or a collection of forces total = !

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