ESS 3301 Lec 6 - Projectile Motion II - Flight

# ESS 3301 Lec 6 - Projectile Motion II - Flight -...

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Announcements Announcements Exam 1 update Bouncing (1) and Jumping (2) Problem Sets 4 & 5 and keys posted

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Projectile Motion II Projectile Motion II Flight Flight ESS 3301-003 Lecture 6 Reading: McGinnis Ch 1, 2, 3
Projectile Motion Projectile Motion Projectile motion refers to objects moving in the air Projectiles are Airborne Objects - Thrown Implements e.g. Balls, discus, shot - Animals (this includes humans and dwarfs) e.g. Object during flight phase of jumping, diving, gymnastics, aerials “No man will ever throw a dwarf”

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Projectiles Projectiles Once an object leaves the ground, only two forces act upon it. Gravity -9.81 m/s 2 Acts downward vertically Air Resistance Important in discus, ski diving, ski jumping Large velocity, long flight time, and aerodynamic implements Usually considered or assumed 0 m/s 2 or minimal for many activities Short flight times or negligible effects of drag (e.g. vertical jump) Air resistance acts in all directions
Factors Directly Affecting Trajectory Factors Directly Affecting Trajectory Projection Angle Take-off angle Projection Velocity Take-off velocity Horizontal Component Vertical Component Projection Height Height of take-off

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Affects of Take-off Height Affects of Take-off Height S Vert. Ground S Vert. Bench S Hor. Bench S Hor. Ground
Constant Acceleration Constant Acceleration Equations of Motion Equations of Motion v f = v i + a·t This is simply a rearrangement of: s = v i ·t + ½·a·t 2 v f 2 = v i 2 + 2·a·s 2 Notes : 1) Sometimes you see u for v i and v for v f 2) Sometimes you see “d” or “p” rather than “s” t v a = t v v a i f - =

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Example Calculations Example Calculations Given: Ball projected from the ground Flight time is 1.4 seconds How high did the ball go?
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## This note was uploaded on 10/24/2011 for the course BIOLOGY 1402 taught by Professor Held during the Fall '11 term at Texas Tech.

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ESS 3301 Lec 6 - Projectile Motion II - Flight -...

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