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# Lecture-04 - Free FreeFallandUp/DownThrow Lecture#04...

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Free Fall and Up/Down Throw L t #04 Ch 2 6 & 2 7 Lecture #04 – Ch. 2.6 & 2.7 Physics 125 – Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] Office Hours: 2:00 4:00 / Mon & Tue in Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Applications of (1D) Linear Kinematics When dealing with (1D) linear motion in a gravitational field, m a = g g = 9 8 and x is usually replaced with the label y: G G G G G ( ) 2 a = g, g = 9.8 s G G ( ) [ ] 0 0 0 v + v 1. y = y + t t displacement, velocity, time 2 G G 2. v = G ( ) [ ] 0 0 v + g t t velocity, acceleration, time G G ( ) ( ) [ ] 2 0 0 0 0 g 3. y = y + v t t + t t displacement, acceleration, time 2 G G G G ( ) [ ] 2 2 0 0 4. v = v + 2g y y displacement, speed, acceleration G G G
Free Fall 0 t 0 y G t a G v G y G 0 s 2 9.8 m/s 0 y + 0 m/s y + v t 0 v G 0 v = 0 m/s ( ) + The 4 kinematic equations become: 0 y + ( ) 0 2 v 1. y = y t 2 2 v = 9 8 m/s t 2 a 9.8 m/s = − 2 2 0 2. v = 9.8 m/s 9.8 m/s 3. y = y t 2 v ( ) ( ) 2 2 0 4. v = 2 9.8 m/s y y ; y + 0 here y y is negative.

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