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Buoyancy & Aerodynamics WHY THINGS FLOAT AND FLY MSU 2006 Jeff Rhoads & Terry Ballinger.

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Presentation on theme: "Buoyancy & Aerodynamics WHY THINGS FLOAT AND FLY MSU 2006 Jeff Rhoads & Terry Ballinger."— Presentation transcript:

1 Buoyancy & Aerodynamics WHY THINGS FLOAT AND FLY MST @ MSU 2006 Jeff Rhoads & Terry Ballinger

2 Outline Introduction Introduction What is a Fluid? What is a Fluid? Aerodynamics Aerodynamics Buoyancy Buoyancy Today’s Activity Today’s Activity

3 Introduction – Why things fly Aerodynamics – Why things fly Lift Lift Drag Drag – Why things float Buoyancy – Why things float Density Density Volume Displaced Volume Displaced … concepts involve fluids.

4 What is a Fluid?

5 A substance tending to or to the outline of its container A substance tending to flow or conform to the outline of its container What are some other examples?

6 Aerodynamics

7 Aerodynamics The study of and the resulting of objects that move. The study of forces and the resulting motion of objects that move through the air. … drag & lift are important.

8 Example: Jet Airliner … drag & lift are important.

9 Drag (opposite to direction of travel) due to motion through the air Opposing force (opposite to direction of travel) due to motion through the air

10 Drag Friction Drag (opposite to direction of travel) due to motion through the air Opposing force (opposite to direction of travel) due to motion through the air

11 Drag Pressure Drag Friction Drag

12 Lift due to motion through the air Upward force due to motion through the air

13 Lift

14 Why it Flies

15 Buoyancy

16 Buoyancy The tendency of a body to float or to rise when submerged in a fluid The tendency of a body to float or to rise when submerged in a fluid

17 Archimedes Principle A body immersed in a fluid is buoyed up by a force equal to the weight of the fluid it displaces. A body immersed in a fluid is buoyed up by a force equal to the weight of the fluid it displaces.

18 Will it Float? Object What forces act on the object?

19 Will it Float? Weight  W Buoyancy Force  B

20 Will it Float? Weight  W  B

21 Will it Float?  B Weight  W

22 Will it Float?  B Weight  W

23 Will it Float?  W  B

24

25 Object Hovers Object

26 Will it Float?

27 Object Ascends Object

28 Will it Float?

29 Object Sinks Object

30 Example: A Ship USS Dwight D. Eisenhower Weight: 95,000 tons

31 Today’s Activity: Airplanes! Objective Create a set of paper airplanes capable of traveling the furthest, staying aloft the longest, and …

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