1. Projectile Motion
Chapter 6

2. Gravity and projectile motion
Horizontal motion is independent of vertical motion.
There is only the “downwardness” of gravity.
Not “Sidewaysness”. g g
Y axis g
X axis

3. Gun Scenario Sling Shot -> Straight/Drop
“Gravity does not take a holiday on moving objects. g g g

4. Multiple flash exposure
Notice horizontal motion is equal distance all the way.
Vertical motion mirrors free fall.
(accelerating as it falls)

5. Koozie Sling shot demonstration
If I aim directly a target across the room will it hit above or below or at it?
Where will it hit? What should I do?

6. Upward projectiles
Higher the angle the farther the distance until you reach 45 degrees then distance goes back down.
Angles that add to 90 degrees are same distance.

7. If gravity did not exist….
Then a cannonball would continue on a straight path
With gravity it falls back
The vertical distance it falls beneath any point on the straight line is the same vertical distance it would fall if it were dropped from rest and had been falling for same amount of time.
Cool, huh?!!

8. If gravity did not exist cont…
If you shot a cannonball with no gravity after T seconds it would be at a point along a straight path but gravity has it directly below.
How far?

9. If gravity did not exist cont…
If you shot a cannonball with no gravity after T seconds it would be at a point along a straight path but gravity has it directly below. How far?
Answer: (4.9t2) or d= ½ at2

10. The velocity of a projectile
Note: the vertical component (y) changes but horizontal (x) is stays the same