1. 1-2-3 Ground Launched Projectiles
Fire Away!!!
Ground Launched Projectiles

2. What is a projectile?
A flying object with no means of propulsion after its launch.
Can be launched with any VELOCITY and at ANY ANGLE
May be subjected to AIR RESISTANCE

3. Initial velocity 12 m/s 30° What is the horizontal part of
the soccer ball’s initial velocity?
What is the vertical part of
the soccer ball’s initial velocity?
vix = vi cos θ
viy = vi sin θ
12 m/s
6 m/s
30°
10.4 m/s

4. What assumptions can we make?
Horizontal
Initial velocity = vi cos θ
Acceleration = 0
Vertical
Initial velocity = vi sin θ
Acceleration = m/s2
Vertical speed = 0 at top

5. Projectile Vector Diagram
vfy = 0 (at top)
x y
a = a = m/s2
vi = vi cos θ vi = vi sin θ
vf = 0 (at top)
ttot = 2t1/2
ttot