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PHYSIC

PHYSIC. FLUID STATICS. SMK PERGURUAN CIKINI. DENSITY. Density of a substance is defined as the ratio of mass substance with its volume. Note: ρ = density of substance (kg/m 3 ) m = mass of substance kg V = volume of substance m 3. Density unit is often expressed I g/cm 3

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PHYSIC

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  1. PHYSIC FLUID STATICS SMK PERGURUAN CIKINI

  2. DENSITY Density of a substance is defined as the ratio of mass substance with its volume Note: ρ = density of substance (kg/m3) m = mass of substance kg V = volume of substance m3 Density unit is often expressed I g/cm3 1 g/cm3 = 1000 kg/m3 Isi dengan Judul Halaman Terkait

  3. A F = w PRESSURE Pressure are force per unit area Note: p = pressure (N/m2) or Pascal (Pa) F = force N A = area of pressure m2 Isi dengan Judul Halaman Terkait

  4. h water x HYDROSTATIC PRESSURE Fluid pressure at rest is called hydrostatic pressure. x Note: ρ = density of liquid (kg/m2) g = earth gravitational acceleration (m/s2) h = depth of liquid measured from its surface to point the pressure is give (m) px = hydrostatic pressure (N/m2) Based on the formula of hydrostatic pressure above, found that hydrostatic pressure depends on the liquids density, height or depth of liquids, and earth gravitational acceleration Isi dengan Judul Halaman Terkait

  5. water hole water spray HYDROSTATIC PRESSURE Scientific activity The strenght of water sprays or liquids sprays is determined by the ammount of pressure in the water or liquids. It means the deeper a location in the water or liquids froms its surface then the large its hydrostatic pressure Isi dengan Judul Halaman Terkait

  6. Source: http://superphysics.netfirms.com/t240754a.jpg FUNDAMENTAL LAW OF HYDROSTATIC Every point located on a plane in a liquid have the same hydrostatic pressure Isi dengan Judul Halaman Terkait

  7. water oil hA hB A B FUNDAMENTAL LAW OF HYDROSTATIC A U-shaped tube contains oil and water, as shown in below figure: Point A and B are both lie on the same plane and type of liquid. According to fundamental law of hydrostatics, then both points have the same pressure, so that: pA = pB ρoil g hA = ρwater g hB ρoil hA = ρwater hB Note: ρoil = oil density ρwater = water density hA = oil colum height hB = water colum height Isi dengan Judul Halaman Terkait

  8. F1 A2 A1 F2 PASCAL’S LAW The pressure applied to an enclosed fluid is transmitted equally in all directions and to all parts of the container Application example of Pascal’s law Note: F1 = force on A1 (N) F2 = force on A2 (N) A1 = section area 1 (m2) A2 = section area 2 (m2) Principle of hydroulic jack Source: http://home.wxs.nl/~brink494/hydr.htg/pascal.gif Isi dengan Judul Halaman Terkait

  9. ARCHIMEDES’S LAW A body that is partly, or entirely, immersed in water or any fluids will experience the buoyancy force that is equal to the weight of the fluid displaced by the body FA = wbf Note: FA = buoyancy force wbf = the weight of fluid displaced FA = ρf Vbf g Note: ρf = fluid density (liquid) Vbf = Volume of liquid displaced g = earth gravitational acceleration Isi dengan Judul Halaman Terkait

  10. FA water w ARCHIMEDES’S LAW A body is said sinking if it is completely immersed and be on the bottom of liquid. Note: mb = mass of body mf = transfered liquid mass Vb = volume of body Vf = transfered liquid volume ρb = the density of body ρf = the density of liquid The singking body FA < w mf g < mb g Vfρf g < Vbρb g ρf < ρb Isi dengan Judul Halaman Terkait

  11. FA water w ARCHIMEDES’S LAW A body is said suspending if it is completely immersed but does not reach the bottom of liquid. Note: mb = mass of body mf = transfered liquid mass Vb = volume of body Vf = transfered liquid volume ρb = the density of body ρf = the density of liquid The suspending body FA = w mf g = mb g Vfρf g = Vbρb g ρf = ρb Isi dengan Judul Halaman Terkait

  12. FA water w ARCHIMEDES’S LAW FA = w mf g = mb g Vfρf g = Vbρb g because Vf < Vb then ρf > ρb The floating body A body is said floating if it is partly immersed a liquid. Isi dengan Judul Halaman Terkait

  13. SURFACE TENSION OF LIQUID The attractive force among like particles is called cohesion while that of among unlike particles is called adhesion. Each particle in a liquid is attracted with equal force to all direction by the particles near it, so that the resultant force applied on the particle is equel to zero. Isi dengan Judul Halaman Terkait

  14. SURFACE TENSION OF LIQUID Surface tension can be defined as the magnitude of force experienced at liquid surface per unit length. water Note: w1 w2 One layer of soap water Isi dengan Judul Halaman Terkait

  15. cohesion > adhesion CAPILLARITY A phenomenon of raising and descending of liquid in capillary pipe is called cpillarity water mercury cohesion < adhesion The water in capillary pipe will continue to raise until the equilib-rium is reached, that is water weight displaced is balanced with adhesion force. While the descending of mercury in capillary pipe occurs because the cohesion among mercury particles is greater than the adhesion between mercury particles and glass particles. Isi dengan Judul Halaman Terkait

  16. CAPILLARITY The amount of liquid increase or decrease in capillary pipe is determined by the equation below. • Note: • h = increase or decrease of liquid level (m) • g = surface tention (N/m) • r = liquid density (kg/m3) • = contact angle g = gravitational acceleration (m/s2) r = the radius of capillary pipe (m) Isi dengan Judul Halaman Terkait

  17. VISCOSITY OF FLUID AND STOKES LAW The maesure of viscosity of a liquid is expressed by viscosity. • Note: • Ff = friction force of liquid (N) • k = coefficient (depends on object geometric shape) • = coefficientviscosity(Pa s) • v = kecepatan gerak benda (m/s) Ff = kh v The equation of friction force in fluid for sperical objects is formulated as follows. Ff = 6 k rh v Isi dengan Judul Halaman Terkait

  18. arah gerak FA FA f w = m g VISCOSITY OF FLUID AND STOKES LAW Attention picture this below! At the moment the object moving at terminal velocity, on the object act three force, those are weight, buoyancy force exerted by fluid, and friction force of fluid. SF = 0 + m g – FA – Ff = 0 m g – FA = Ff Ff = m g –Ff minyak Isi dengan Judul Halaman Terkait

  19. VISCOSITY OF FLUID AND STOKES LAW Note: vT = terminal velocity (m/s) h = viskositas fluida (Ns/m2) rb = dencity of body (kg/m3) rf = dencity of fluid (kg/m3) g = gravitational acceleration (m/s2) r = radius of sphere (m) Isi dengan Judul Halaman Terkait

  20. THANK YOU Isi dengan Judul Halaman Terkait

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