Title: Intro to Water Bottle Rockets

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Presentation transcript:

Title: Intro to Water Bottle Rockets LT: I will be able to design a water bottle rocket that uses force generated by air pressure and water to make vertical flight.

Read and Record the Following…

Project Outline You will work as a group of FOUR to design a water bottle rocket. You will have to research the function and basic design of water bottle rockets. You will consider the affects of friction and forces, Newton’s Three Laws of Motion, rocket stability and the rocket’s ability to accelerate in your design. You will build a water bottle rocket. YOUR MISSION: Design, build and test a water bottle rocket that will gain maximum altitude when fired.

Project Timeline: 11/4: Project Guidelines and Intro Notes to Rocketry 11/5: Research Day – How Rockets Function 11/6: Research Day – Individual Parts Function and Design 11/7: Design Rocket, Write Launch Plan 11/10: Build Rocket, Test Rocket, Adjustments 11/11: Launch Rocket #1 11/12: Launch Rocket #2 11/13: Data Analysis and Reteach 11/14: Unit Final

Intro to Rocketry Read and Record Notes in your Science Notebook. Include diagrams! Make note of VOCABULARY and REVIEWED concepts.

Basic Design and Function of Water Bottle Rockets

Basic Design and Function of Water Bottle Rockets

Parts of a Water Bottle Rocket BODY: Holds water and pressurized air; Shape, size, length etc… will affect drag on rocket NOSE CONE: affects drag on rocket FINS: location and size affect stability of rocket’s path PARACHUTE: *optional; affects deceleration of rocket on return NOZZLE: water in, pressure in, water out

The Science Behind it…

Rocket Motion - THRUST Rocket motors generate push, or “thrust,” by expelling a propellant out of the nozzle. NEWTON’S 3rd LAW explains the motion created by thrust. Exhaust pushes downward, thrust is the opposite push upward!

Thrust and Acceleration The greater the “thrust,” the faster your rocket will accelerate. NEWTON’S 2ND LAW supports this statement. When a net, or excess, force is applied to an object, it will accelerate in the direction of the force. Force (thrust) = Mass x Acceleration  Or we can write it as:  Acceleration = Force ÷ Mass

Rockets and Acceleration Will the rocket accelerate faster at the beginning of flight or later? Why?

Forces Acting on Water Rockets Aerodynamics Lift and Drag (Air Resistance) Thrust Force upward push CONCEPT: How much pressure and water needed? MAX pressure? Weight Force: Overall mass of the rocket parts Acts through the center of gravity on rocket Affects the stability

Drag Two advantages of having a rocket with low air drag are: Your rocket achieves faster speeds and higher altitudes. Fuel consumption decreases. In the case of your rocket, all the fuel (water) will be used anyway. But with low air drag, the fuel will be used more efficiently (less water per meter of altitude).

Tomorrow: You will continue your research and understanding of rocketry concepts using an online forum. Be prepared to compare notes with online tasks and to include ADDITIONAL information.