1. Compound motion Three types of motion: Vertical motion
Horizontal motion
Combination of 1. and 2.
Projectile motion
An object thrown into the air
Basic observations:
Gravity acts at all times
Acceleration (g) is independent of the object’s motion

2. Projectile motion Vertical projectile Slows going up Stops at top
Accelerates downward
Force of gravity acts downward throughout
Horizontal projectiles
Horizontal velocity remains the same (neglecting air resistance)
Taken with vertical motion = curved path

3. 2.5 Compound Motion Horizontal Projectiles:
Gravity is constantly working on a horizontal projectile- increasing its downward velocity
If we ignore air resistance, horizontal velocity remains CONSTANT
The combination of these two paths results in a curved trajectory

4. 2.5 Compound Motion
Since horizontal motion is independent of gravity, a horizontal projectile will hit the ground at the same time as an item dropped from the same height

5. 2.5 Compound Motion Horizontal Projectiles:
When an object is launched at an angle:
gravity is always pulling downward
first half of path is identical to second half of path
Combination of these 2 forces results in a trajectory in the shape of a parabola

6. 2.5 Compound Motion Horizontal Projectiles:
The second half of a parabola is identical to the first half ignoring air resistance

7. http://www. physicsclassroom