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Introduction to 2D Projectile Motion. Projectile Motion. An example of 2-dimensional motion. Something is fired, thrown, shot, or hurled near the earth’s surface. Horizontal velocity is constant. Vertical velocity is accelerated. Air resistance is ignored. y. x. Trajectory of Projectile.

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## Introduction to 2D Projectile Motion

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**Projectile Motion**• An example of 2-dimensional motion. • Something is fired, thrown, shot, or hurled near the earth’s surface. • Horizontal velocity is constant. • Vertical velocity is accelerated. • Air resistance is ignored.**y**x Trajectory of Projectile This projectile is launched an an angle and rises to a peak before falling back down.**y**x Trajectory of Projectile The trajectory of such a projectile is defined by a parabola.**y**x Trajectory of Projectile The RANGE of the projectile is how far it travels horizontally. Range**y**x Trajectory of Projectile The MAXIMUM HEIGHT of the projectile occurs halfway through its range. Maximum Height Range**y**g g g g g x Trajectory of Projectile Acceleration points down at 9.8 m/s2 for the entire trajectory.**y**y x x t t Position graphs for 2-D projectiles**…you must first resolve the initial velocity into**components. Vo,y = Vo sin Vo,x = Vo cos To work projectile problems… Vo **y**x Trajectory of Projectile Velocity is tangent to the path for the entire trajectory. v v v vo vf**y**x Trajectory of Projectile The velocity can be resolved into components all along its path. vx vx vy vy vx vy vx vy vx**y**x Trajectory of Projectile Notice how the vertical velocity changes while the horizontal velocity remains constant. vx vx vy vy vx vy vx vy vx**y**x Trajectory of Projectile Where is there no vertical velocity? vx vx vy vy vx vy vx vy vx**y**x Trajectory of Projectile Where is the total velocity maximum? vx vx vy vy vx vy vx vy vx**2D Motion**• Resolve vector into components. • Position, velocity or acceleration • Work as two one-dimensional problems. • Each dimension can obey different equations of motion.**Horizontal Component of Velocity**Newton's 1st Law • Is constant • Not accelerated • Not influence by gravity • Follows equation: x = Vo,xt**Vertical Component of Velocity**Newton's 2nd Law • Undergoes accelerated motion • Accelerated by gravity (9.8 m/s2 down) • Vy = Vo,y - gt • y = yo + Vo,yt - 1/2gt2 • Vy2 = Vo,y2 - 2g(y – yo)**vo**Launch angle Zero launch angle**vo** Launch angle Positive launch angle**vo** - vo Symmetry in Projectile Motion Launch and Landing Velocity Negligible air resistance Projectile fired over level ground**t**to = 0 Symmetry in Projectile Motion Time of flight**t**to = 0 2t Symmetry in Projectile Motion Time of flight Projectile fired over level ground Negligible air resistance

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