Buoyancy & Aerodynamics

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

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

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

4. What is a Fluid?

5. What is a Fluid? • 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 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 • Opposing force (opposite to direction of travel) due to motion through the air

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

11. Drag • Opposing force (opposite to direction of travel) due to motion through the air Friction Drag Pressure Drag

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

13. Lift • Upward force due to motion through the air

14. Why it Flies

15. Buoyancy

16. Buoyancy • 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.

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

19. = W Weight Will it Float? = B Buoyancy Force

20. = W Weight Will it Float? = B

21. = W Weight Will it Float? = B

22. = W Weight Will it Float? = B

23. Will it Float? = W = B

24. Will it Float?

25. Will it Float? Object Object Hovers

26. Will it Float?

27. Will it Float? Object Object Ascends

28. Will it Float?

29. Will it Float? Object Object Sinks

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 …