Book+1+3.4

3.4 IV. Applying Bernoulli's Principle A. What happens when fluid moves? 1. Faster a fluid moves, less pressure the fluid exerts. 2. The pressure exerted by moving stream of fluid is less than the pressure surrounding fluid - Bernoulli's Principle i. As air pressure decreases, air speed increases. ii. air moves from high to low pressure iii. Swiss scientist - Daniel Bernoulli iv. Object design affects lift a.)Air moves faster above an object, pressure pushes object up (lift) (airplan) b.) air moves faster below the object, pressure pushes it downward (spoiler on car) 3. Flying with Bernoulli 4 things needed to fly: I. Lift- see above- up ii. Thrust- jet or propeller to move forward iii. Weight- gravity- heavier- faster- down iv. Drag- air resistance- back For a plane to fly, lift must be grater than weight and thrust must be greater than a drag. 4.Orville and Wilbur Wright I. December 1903 ii. Kitty Hawk, NC iii. 12 sec 36 meters iv. Flew first plane B. Bernoulli at Home 1. Smoke up chimney- fire heats air in fireplace causing it to rise and creating low pressure. High pressure in the room moves forward the fireplace preventing smoke in the room. Wind blowing air across the chimney lowers air pressure and high room air pressure pushes it up and out. 2. shower curtain attack- how water heats the air causing it to rise creating low pressure. The high pressure from the rest of room moves in and causes the curtain to move and attack. 3. Frisbee- the curve of the Frisbee creates more air speed across the top. This makes low pressure helps the Frisbee fly- high pressure is below it. 4. Curve ball- the spin of the ball creates increase air speed on one side which causes a curve towards that side

Quiz 3.4 1.Below the wing 2.above the wing 3. it is being pushed downward 4. the push becomes stronger 5. As wind speeds up, pressure on top of chimney will decrease according to Bernoulli's Principle. Smoke will move up faster, going from higher air pressures at the bottom to lower pressure area near top of chimney. 6. The pressure exerted by a moving stream of fluid is less than the surrounding fluid. An upward force caused by differences in pressure.

Study Guide 9. Bernoulli's principle 19. true 20. true 27. higher