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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.

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Presentation on theme: "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."— Presentation transcript:

1 Principles of Rocketry

2 Our Water Rockets Instead of hot gases creating pressure, we use a bike pump and store pressure 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) (Rocket is forced up)

3 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 Pascals Principle Water Rockets Work Like Real Rockets DRAW THE ROCKET AND WRITE EVERYTHING DOWN

4 Other factors that make the Water Bottle Rocket Fly Compressed Air + Water Dont WRITE This

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

6 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= F m

7 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). DONT WRITE WHATS IN YELLOW

8 Stability During Flight Center of GravityCenter of Pressure The orientation of fins and distribution of mass help make the rocket stable. DONT WRITE THIS DOWN

9 Stability During 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 DONT WRITE THIS DOWN

10 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

11 Center of Gravity

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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.

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


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