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Bernoulli’s Lawfor senior high school

class XI

By :FITRIA HANARIS(123184246)

SK-KD• Competency Standards:Apply the concepts and principles of classical mechanics of continuous systems in solving problem

• Basic Competence:Analyzing the laws relating to static and dynamic fluid and its application in daily life

Indicator

1. Magnitudes define the Bernoulli principle2. Linking magnitudes in the Bernoulli principle3. Analyzing the Bernoulli principle in everyday physics problems

Introduction • Why are airplanes made of very weight metal to fly in space?

Bernoulli’s principleBernoulli principle was first proposed by Daniel Bernoulli (1700-1782)."Fluid pressure at a high speed is smaller than at a lower speed"The greater the velocity of a fluid in a pipe then the pressure is getting smaller and conversely the smaller the velocity of a fluid in a pipe, the greater the pressure.

Bernoulli’s Principle

look at the pictureFluid flow in the pipe from end 1 to end 2 :v1 = velocity at the end of 1v2 = velocity at the end of the 2h1 = height of the tip 1h2 = height of the tip 2P1 = Pressure at the end of 1P2 = pressure at the end of 2

Amount of pressure, volume unity kinetic energy, potential energy and volume union has the same value at every point along a flow lineconstant2

1 2 ghvP

22221

211 2

121 ghvPghvP

Holey a tank

ghv 2

Velocity of fluid leaking from the wall pickup

v2: velocity of fluid leaking through the walls of the tub (m / s)g: acceleration of gravity (10 m / s ^ 2)h: fluid depth (from the surface to the hole in the wall of a tank (m)h1: height from the bottom surface of the bath liquid (m)h2: height of the base tub hole (m)

Lifting Force Plane• The top of the wings curved, so the air speed over the wing (v2) is greater than the speed of the air below the wing (v1) this causes the air pressure on the upper wing (P2) is smaller than the air pressure under the wing of (P1), so that the force from the bottom (F1) is greater than the force of the upper (F2), comes the plane lift.

P2: pressure from above plane (Pa)P1: pressure from below the plane (Pa)v2: air speed on the plane (m / s)v1: velocity of air under the plane (m / s)ρ: air density (Kg/m3)

Application Bernoulli’s principle

• Carburetor, is a machine tool in a vehicle that function to produce a mixture of fuel and air mixture in the cylinder is inserted into the engine for combustion.

• Venturimeter, is a tool for measuring the speed of the fluid in the pipe.

• Pitot tube, is a tool for measuring the speed of the gas in the pipe from the gas cylinder.

• Mosquito sprayer / perfume

Exercise• In model plane air speed at the top of the 50 m / s and the speed at the bottom of 40 m / s, if the air density 1.2 Kg/m3, upper air pressure 103000 Pa plane. What is the pressure of the air below the wing?

a. 103504 pa c. 103544 pa b. 103540 pa d. 103500 pa

Good (y) Your answer is true ;)

Sorry you are answer wrong

Please to try again !!!Fighting ^_^

Refferences• Giancoli, Douglas C. 1998. PHYSICS Fifth Edition. Printice-Hall, Inc.

• Tipller, Paul A. 1991. PHYSICS for Scientists and Engineers. Worth Publisher, Inc.

• Haryadi, Bambang. 2009. Fisika SMA untuk SMA Kls XI.Jakarta: Pusat Perbukuan

• Muliana, I Wayan, dkk. 2007. FISIKA untuk SMA/MA Kelas XI. Jakarta: PT Perca.

• Supiyanto. 2004. FISIKA SMA Jilid 2. Jakarta: Erlangga.

THANKS