Horizontal Projectiles Demo: Which ball falls faster to the ground? Video: MYTHBUSTERS – Bullet Fired vs. Dropped

y vi viy=0 Height = Dy time = t x

y vix=vi time = t x Range = Dx

y x

y x

y ax = 0 m/s2 time = t ay = g = - 9.81m/s2 x

Horizontal Motion of a Horizontal Projectile is Constant Motion y X – constant motion ax=0 (horizontal) vx=vi=constant dx=vit x

Vertical Motion of a Horizontal Projectile is Accelerated Motion (Free Fall) y Y – accelerated motion ay=-9.81 m/s2 (free fall) vy=0+(-9.81 m/s2 )t dy=H+(-4.905 m/s2 )t2 x

A Horizontal Projectile is Half of a Parabola, and is the Addition of 2 Independent Motions y Horizontal Projectile (half parabola) = Constant Motion (horizontal) + Accelerated Motion (vertical) x