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Lecture 7 Feb. 4

# Lecture 7 Feb. 4 - Lecture 7 Examples of Projectile Motion...

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Physics 102 Lecture 7 Slide 1 Department of Physics, University of Arizona Lecture 7: Examples of Projectile Motion Motivation: Objectives: Solutions of real-world problems in projectile motion Map out an efficient strategy for solving projectile motion questions Apply the basic equations of projectile motion to word problems Find how the projectile range varies with launch angle

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Physics 102 Lecture 7 Slide 2 Department of Physics, University of Arizona Example: Jumping over a row of cars (horiz. platform) A stunt driver drives off a horizontal platform 1.5 m above the roofs of a row of cars 20 m long. What is the minimum velocity at the platform required to clear this row of cars? 1.5 m 20 m v 0 =? gy v v v gt t v y y gt v v v t v x v v x y y y y y y y x x x 2 : y vs. : t vs. : t vs. and : eqns 2 0 2 2 2 1 0 0 0 0 - = - = - = = = Equations (origin at end of platform): Know: v 0y = 0; final values x = +20 m and y = - 1.5 m Want: v 0x v 0 = ? (solve in 2 steps) ( 29 m/s 1 . 36 20 ) 8 . 9 ( ) 8 . 9 ( ) )( 0 ( 5 . 1 ) 2 ( / 20 20 ) 1 ( 0 2 0 2 1 2 2 1 2 2 1 0 0 0 0 = - = - = - - = = = = v v t t gt t v y v t t v t v x y x y x
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Lecture 7 Feb. 4 - Lecture 7 Examples of Projectile Motion...

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