Principles of Rocketry. Our Water Rockets Instead of hot gases creating pressure, we use a bike pump and store pressure Instead of hot gases creating.

Principles of Rocketry

Our Water RocketsOur Water RocketsInstead of hot gases creating Instead of hot gases creating pressure, we use a bike pump and pressure, we use a bike pump and store pressurestore pressure

Action: Expelling water from engine bottle. Action: Expelling water from engine bottle.

(water is forced down) (water is forced down)

Reaction: Water resisting against Reaction: Water resisting against rocket body. rocket body.

(Rocket is forced up)(Rocket is forced up)

High Air pressure is transmitted equally in all directions and parts of the fluid.

Water forced out and down by air pressure

Action:

Reaction:

Bottle forced up by water being expelled down

Pascal’s Principle

Water Rockets Work Water Rockets Work Like Real RocketsLike Real Rockets

DRAW THE ROCKET AND WRITE

EVERYTHING DOWN

Other factors that make the Water Bottle Rocket Fly Compressed Air + Water

Don’t WRITE This

How Newton's Laws Affect Our Rockets

• 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.

WRITE THIS

Newton's Second Law

This is why you need just the right mass and force to achieve a good acceleration

80psi is perfect for 275-350g

a = Fm

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).

DON’T WRITE WHAT’S IN YELLOW

Stability During FlightStability During Flight

Center of GravityCenter of Pressure

The orientation of fins and distribution of mass help make the rocket stable.

DON’T WRITE THIS

DOWN

Stability During Stability During Flight….Flight….

Think about a dart….

Fins or feathers in the rear act like wind veins and trail behind Heavy mass in front carries the

momentum

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DOWN

Newton's 3 Laws Explains Everything

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.

WRITE THIS

Center of Gravity

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. 

Title: Rocket Lab

Purpose:

Hypothesis:

Procedure:

Drawing: Rocket Design Rough Draft (label all parts, give dimensions, shape, etc.)