1. Principles of Rocketry

2. Our Water Rockets
Instead of hot gases creating pressure, we use a bike pump and store pressure
Action: Expelling water from engine bottle.
(water is forced down)
Reaction: Water resisting against rocket body.
(Rocket is forced up)

3. DRAW THE ROCKET AND WRITE EVERYTHING DOWN
Water Rockets Work Like Real Rockets
DRAW THE ROCKET AND WRITE EVERYTHING DOWN
Pascal’s Principle
Reaction:
Bottle forced up by water being expelled down
High Air pressure is transmitted equally in all directions and parts of the fluid.
Action:
Water forced out and down by air pressure

4. Other factors that make the Water Bottle Rocket Fly
Compressed Air + Water
Don’t WRITE This

5. How Newton's Laws Affect Our Rockets
WRITE THIS
Newton's First Law
The pressure inside the rocket must overcome the INERTIA of the rocket’s weight to launch. If the rocket has too much water, it will have too much weight/INERTIA.

6. a = F m Newton's Second Law
This is why you need just the right mass and force to achieve a good acceleration
80psi is perfect for g a = F m

7. DON’T WRITE WHAT’S IN YELLOW
Newton's Third Law
When you pull the pin, that area of High Air Pressure in the top of your rocket engine is going to force, throw, hurl, spew that "massive" water out the bottom of your rocket at a great speed. The water and air is pushing down (action force), so your rocket must go up (reaction force).

8. Stability During Flight
The orientation of fins and distribution of mass help make the rocket stable.
Center of Pressure
Center of Gravity
DON’T WRITE THIS DOWN

9. Stability During Flight….
Think about a dart….
DON’T WRITE THIS DOWN
Fins or feathers in the rear act like wind veins and trail behind
Heavy mass in front carries the momentum

10. Newton's 3 Laws Explains Everything
WRITE THIS
Newton's 3 Laws of Motion
#1 An object will stay at rest unless a force acts upon it.
#2 Force = Mass x Acceleration
#3 For every action there is an equal and opposite reaction.

11. Center of Gravity

13. The next drawing indicates how the fin should look once folded.
Mark straight lines on the bottle by putting the bottle in the door frame or a right angle and trace a line on the bottle with a marker. Use these lines as guides to place the fins on the bottles. 

16. Title: Rocket Lab
Purpose:
Hypothesis:
Procedure:
Drawing: Rocket Design Rough Draft (label all parts, give dimensions, shape, etc.)