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Lecture04_Pushkar_2012_Jan23

# Lecture04_Pushkar_2012_Jan23 - PHYSICS 220 Lecture 04...

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Lecture 4 Purdue University, Physics 220 1 Lecture 04 Forces and Motion in 1 D Textbook Sections 3.2-3.6 PHYSICS 220

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Lecture 3 Purdue University, Physics 220 2 Un importable 2012 #00424301,2.00,2.00 #0E00D8D6,2.00 #2236D4C0,4.00,4.00 #225BEB92,4.00 #80330CBF,4.00,4.00 #809B0813,2.00 #81709E6F,2.00,2.00 #817EE11E,6.00 • #81C6B5F2,2.00,2.00 #821C4BD5,2.00 #8279AE55,4.00,4.00 #831033A0,4.00 #8341E92B,6.00,6.00 #834C955A,6.00 #834F418D,6.00,6.00 #8351A674,4.00 #83CA7831,4.00,4.00 #83DF98C4,6.00
Lecture 4 Purdue University, Physics 220 3 Mass and Weight Mass: quantifies the amount of inertia that an object possesses – an intrinsic property of the object Weight (Gravitational force exerted by the Earth) W = mg (g-acceleration due to gravity) g = GM earth /(r earth ) 2 = 9.8 m/s 2 (G – universal gravitational constant, more in Chapter 5)

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Lecture 5 Purdue University, Physics 220 4 mg N y x Apparent Weight Recall: Σ F = m a Consider person accelerating up in an elevator Draw FBD Apply Newton’s second law N – mg = ma N = m(g+a) Apparent weight is equal to normal force from scale or floor Note: in free fall a=-g so N=0
Lecture 5 Purdue University, Physics 220 5 A person has a mass of 50 kg. What is their apparent weight when they are riding on an elevator Going up with constant speed 9.8 m/s Going down with constant speed 9.8 m/s

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