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# Projectile Motion

Projectile Motion. Paul Beecham Margaret River SHS 2AB Physical Education Studies. Projectile Motion. Involves the flight of a body through the air In sports such as javelin and basketball the body is inanimate.

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## Projectile Motion

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1. Projectile Motion Paul Beecham Margaret River SHS 2AB Physical Education Studies

2. Projectile Motion • Involves the flight of a body through the air • In sports such as javelin and basketball the body is inanimate. • In sports such as diving and gymnastics, the person or performer themselves are the body. • In some sports it is essential to understand the flight of an object, eg tennis.

3. Trajectory It is the path a projectile follows in its passage through the air. The instant at which a body becomes a projectile is known as the instant of release The trajectory of a body is the combination of vertical motion and horizontal motion.

4. Horizontal and Vertical Motion • The horizontal distance a body travels is known as the range of projectiles • The vertical velocity imparted to an object at the I.O.R. is almost entirely responsible for lifting the body into the air. • The time in flight of a body is equal to the time it takes the projectile to reach the peak of it’s flight (trajectory up), plus the time it takes to return from this peak to the point of landing (trajectory down)

5. Range of Projectiles • Dependant on three factors • Velocity of Release (VOR) • Angle of Release (AOR) • Height of Release (HOR)

6. Velocity of Release • The VOR at the Instant of Release will determine the height and length of the trajectory. • Vertical velocity affects the height the projectiles reaches and the time in flight • Horizontal velocity affects the distance a projectile will travel.

7. Angle of Release • The angle at which an object is released determines the shape of the projectile’s trajectory (flight path) • The optimum angle is dependant upon the aim of the activity (eg increased angle for steeper heights – high jump) • AOR of 45 degrees will result in greatest distance possible (H.V.= V.V.) • AOR > 45 degrees means shorter distance, greater height and longer flight time ( V.V > H.V.) • AOR < 45 degrees means longer distances, lower heights and shorter flight time (H.V > V.V.)

8. Height of Release • This is the difference between the height of release position and the height of the landing position of the object. • T.U. = T.D. : Object is released and lands at the same height (eg a gymnast performing a somersault) • T.U. < T.D. : Shot put • T.U. > T.D. : Basketball

9. Range of Projectiles • Increasing the height of release results in greater flight time and greater distances (if AOR and VOR remains constant) • When the height of release and the landing are not the same level, the time of flight can be altered by changing both the VOR and the AOR (eg shot put) Demonstration

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