31 3.4 Projectile MotionProjectile – any object that is launched by some means and continues in motion by its own inertiaEX: a cannonball shot from a cannona stone thrown in the aira ball rolling off the table
32 Gravity Gravity acts DOWNWARD A ball moving horizontally is immune to the effects of GRAVITY on its velocity.There is no vertical component, only a horizontal component.
33 GravityThe instant ball is dropped, gravity acts on it,pulling it toward the center of the earth.Now it only has a vertical component.
34 3.5 Upwardly-Moving Projectiles Figure 3.10If a projectile had no gravity acting on it, it would move with this path:
35 Gravity changes the path of the projectile: Gravity pulls the projectiletowards the Earth.
36 Pathways of Projectiles Objects that move at a constant horizontal velocity while being accelerated vertically down, take a path called a PARABOLA.
38 At each point in its path the projectile has velocity vectors such as those below: Each velocity vector has a vertical and a horizontal component.
39 Acceleration is constant for a projectile. Speed and velocity change at each point along the parabolic pathway.What is the speed of the projectile at the very top of its pathway?What is the acceleration of the projectile at the very top of its pathway?
40 Air ResistanceAir resistance is another force that acts on projectiles.It changes the path of a projectile like this: