1. Projectile Motion Let’s Go Skydiving! Principles of Engineering
© 2012 Project Lead The Way, Inc.

2. Skydiving Training Speaking the Lingo
Speed is the distance traveled per unit of time.
Velocity is an object's speed and direction of motion.
Acceleration is a change in velocity over a certain period of time.
Give examples of each term
Add notes to each slide

3. Skydiving Training Speaking the Lingo
Gravity tends to pull all objects toward the center of the earth.
Gravitational Acceleration is the constant describing the acceleration of any object falling toward the earth.
-9.8 m/sec2
-32 ft/sec2
Gravity is expressed as a negative because as a vector force it would point down.

4. 0 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 0 ft/sec

5. 1 Second
Acceleration:
32 ft/sec/sec
Velocity: 32 ft/sec

6. 2 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 64 ft/sec

7. 3 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 96 ft/sec

8. 4 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 128 ft/sec

9. 5 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 160 ft/sec

10. 6 Seconds
Acceleration:
32 ft/sec/sec
Velocity: 192 ft/sec

11. What's more
daring than
Skydiving?

12. The Human Cannonball

13. Human Cannonball Training
Speaking the Lingo
A projectile is any moving object upon which the only active force is gravity.
Gravity pulls all projectiles toward the center of the earth at the same rate.

14. Human Cannonball Training
Speaking the Lingo
Firing Angle (θ) is measured in degrees. It is the angle at which the projectile left the cannon.
Initial Velocity (Vi) is the angular speed of a projectile at the start of its flight.

15. Human Cannonball Training
Don't Try This at Home
4 Seconds
4 Seconds
0 ft/sec
0 ft/sec
3 Seconds
5 Seconds
32 ft/sec
32 ft/sec
2 Seconds
6 Seconds
64 ft/sec
64 ft/sec
1 Second
7 Seconds
96 ft/sec
96 ft/sec
0 Seconds
Initial Velocity (Vi)
8 Seconds
128 ft/sec
128 ft/sec

16. Human Cannonball Training
Gravity OFF
Constant Horizontal Velocity
0 Sec.
1 Sec.
2 Sec.
3 Sec.
4 Sec.

17. Human Cannonball Training
Gravity ON
Constant Horizontal Velocity
Gravitational Acceleration
32 ft/sec2
0 Sec.
1 Sec.
2 Sec.
3 Sec.
4 Sec.

18. Human Cannonball Training Calculating Initial Velocity
Gravity should be substituted in as a negative number. Because the formula has a negative sign in front of g it becomes a positive value for the purpose of solving the equation.

19. Human Cannonball Training Calculating Horizontal Distance

20. Human Cannonball Training Calculating Firing Angle