1. CHECK POINT – FLUID PHYSICS DR. BROWNE

2. 1.Earth’s ________________ is made of a mix of gases called ______________. 1.The molecules of air are in constant __________________ bumping into each other and surfaces. 1.The force of the above molecules is known as __________________. 1.This force is measure with an instrument called ________________________.

4. 5. _____________________ principle states that as the speed of a fluid increases the pressure it exerts ______________________. 6.This means that air at rest has _______________ pressure than air in motion. 7.This principle helps to explain how a wing creates ___________________. 8.Explain how a wing generates lift:

6. 9. The curved shape of a wing is known as a(n) __________________________. 10. The more curved the the wing, the more ____________________________. 11. The less curved the wing, the less ___________________________. 12. When taking off and landing the best wing shape is ________________________. 13. In nature fluids flow from __________________ to ______________________. 14. How does smoke rise from a chimney? 15. Will smoke rise faster on a calm day or a windy day? 16. What are the 4 forces of flight and their directions?

8. 17. Density is a measure of an objects _________________________. It is ratio of ______________ to _______________. 18. Density is the amount of ________________ that is placed in a given _________________. 19. Water has a density of ______________ (include units) at ____________. 20. Objects will float when _________________ and they will sink when _____________. 21. The formula to find density is _____________________. 22. Archimedes principle states that an object in a fluid (which is a _________ or _________), is _______________ or pushed up by a force equal to the weight of the fluid the objects displaces.

10. ANSWER KEY

11. 1.Earth’s atmosphere is made of a mix of gases called air. 1.The molecules of air are in constant motion bumping into each other and surfaces. 1.The force of the above molecules is known as air pressure. 1.This force is measure with an instrument called Barometer.

12. 5. Bernoulli’s principle states that as the speed of a fluid increases the pressure it exerts decreases. 6.This means that air at rest has more pressure than air in motion. 7.This principle helps to explain how a wing creates lift. 8.Explain how a wing generates lift: The curved airfoil cause the air at the top of the wing to travel faster than the air at the bottom of the wing. The fast air on top cause low pressure and the slow air on bottom causes higher pressure generating lift!

13. 9. The curved shape of a wing is known as a(n) airfoil. 10. The more curved the the wing, the more lift and drag. 11. The less curved the wing, the less lift and drag. 12. When taking off and landing the best wing shape is more curved (greater airfoil). 13. In nature fluids flow from high pressure to low pressure. 14. How does smoke rise from a chimney? The hot air rises and the smoke flows from the high pressure inside the chimney towards the low pressure outside the chimney. The low pressure is caused by wind. 15. Will smoke rise faster on a calm day or a windy day? Wind because the pressure is so low 16. What are the 4 forces of flight and their directions? Lift, gravity, thrust, drag

14. 17. Density is a measure of an objects compactness. It is ratio of mass to volume. 18. Density is the amount of matter that is placed in a given volume. 19. Water has a density of 1 g/cm 3 (include units) at 4 degrees C. 20. Objects will float when they are less dense then water and they will sink when there density is more then water. 21. The formula to find density is D = M / V. 22. Archimedes principle states that an object in a fluid (which is a liquid or gas), is buoyed or pushed up by a force equal to the weight of the fluid the objects displaces.