# lecture07 - Physics 101: Lecture 7, Pg 1 Physics 101:...

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Unformatted text preview: Physics 101: Lecture 7, Pg 1 Physics 101: Lecture 07 Exam I-Textbook chapter 4. -Hour Exam 1 is Mon Oct3 Physics 101: Lecture 7, Pg 2 X and Y directions are Independent! Position, velocity and acceleration are vectors F = m a applies in both x and y direction Projectile Motion a x = 0 in horizontal direction a y = g in vertical direction Physics 101: Lecture 7, Pg 3 More 2-D Examples Newtons 3 rd Law Review Relative Motion (second pass) Physics 101: Lecture 7, Pg 4 T m 2 g m 1 g T N y x A block of mass m 1 = 2.6 kg rests upon a frictionless incline as shown and is connected to mass m 1 via a flexible cord over an ideal pulley. What is the acceleration of block m 1 if m 2 = 2.0 kg? X direction F x = m a x : Block 1: T m 1 g sin(30) = m 1 a 1x T = m 1 g sin(30) + m 1 a 1x Y direction F y = m a y : Block 2: T m 2 g = m 2 a 2y Note: a 1x = - a 2y Combine T m 2 g = m 2 a 2y m 1 g sin(30) + m 1 a 1x m 2 g = m 2 a 2y m 1 g sin(30) + m 1 a 1x m 2 g = -m 2 a 1x m 1 a 1x +m 2 a 1x = m 2 g - m 1 g sin(30) (m 1 +m 2 ) a 1x = g (m 2- m 1 sin(30)) 1.49 m/s 2 Physics 101: Lecture 7, Pg 5...
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## This note was uploaded on 02/05/2012 for the course PHYS 101 taught by Professor Ha during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lecture07 - Physics 101: Lecture 7, Pg 1 Physics 101:...

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