Transcript Projectile Motion

PROJECTILE MOTION
PROJECTILES
 Projectile:
any object that is launched
with an initial velocity and continues to
move; affected only by the force of gravity.
 Trajectory: the path a projectile follows.
 Usually parabolic
 Range: horizontal distance covered by a
projectile
 Height: the maximum vertical distance
reached by a projectile
PROJECTILES
Motion in the x-direction
Forces: NONE!
 Velocity: Constant
 Acceleration: ZERO!
 Displacement: object
will move equal
distances every
second.

Motion in the y-direction
Forces: GRAVITY!
 Velocity: Changes
(gets faster going
down)
 Acceleration: -9.81m/s2
 Displacement: the
object will move more
distance each second.

HORIZONTALLY
LAUNCHED



When a projectile is launched horizontally, all of its initial
velocity is in the x-direction.
vx is constant, so the distance in the x-direction is the same
every second
vy is increasing due to the force of gravity, so the distance
in the y-direction increases every second.
LAUNCHED AT AN
ANGLE
On the Way Up:
•vy decreases
•ay is constant
(g = -9.81 m/s2)
•dy decreases
each second
At the Top:
•vy = 0
•ay is constant
(g = -9.81 m/s2)
•vx = only velocity;
constant
On the Way Down:
•vy increases
•ay is constant
(g = -9.81 m/s2)
•dy increases each second
EFFECT OF VARIOUS
LAUNCH ANGLES