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Unformatted text preview: Physics 101: Lecture 6, Pg 1 Physics 101: Lecture 06 Todays lecture will cover Chapter 4 Exam I Physics 101: Lecture 6, Pg 2 Newtons Laws of motion: F=ma Kinematics: x = x + v t + a t 2 Dynamics Today we work in 2 Dimensions! Physics 101: Lecture 6, Pg 3 X and Y are INDEPENDENT! Break 2D problem into two 1D problems y x Physics 101: Lecture 6, Pg 4 Position, Velocity and Acceleration are Vectors! x and y directions are INDEPENDENT! x direction y direction Physics 101: Lecture 6, Pg 5 5 m/s 3 m/s A ball is rolling on a horizontal surface at 5 m/s. It then rolls up a ramp at a 25 degree angle. After 0.5 seconds, the ball has slowed to 3 m/s. What is the magnitude of the change in velocity? A) 0 m/s B) 2 m/s C) 2.6 m/s D) 3 m/s E) 5 m/s y x xdirection v ix = 5 m/s v fx = 3 m/s cos(25) v x = 3cos(25)5 =2.28 m/s ydirection v iy = 0 m/s v fy = 3 m/s sin(25) v y = 3sin(25)=+1.27 m/s Physics 101: Lecture 6, Pg 6 5 m/s 3 m/s A ball is rolling on a horizontal surface at 5 m/s. It then rolls up a ramp at a 25 degree angle. After 0.5 seconds, the ball has slowed to 3 m/s. What is the average acceleration? y x xdirection ydirection Physics 101: Lecture 6, Pg 7 x = x + v 0x t + 1/2 a x t 2 v x = v 0x + a x t v x 2 = v 0x 2 + 2a x x y = y + v 0y t + 1/2 a y t 2 v y = v 0y + a y t v y 2 = v 0y 2 + 2a y y x and y motions are independent !...
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 Spring '11
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