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CAPTER 10 PRESSURE

CAPTER 10 PRESSURE. Basic Competency. To describe pressure on solids, liquid and gases and also its application in daily life. Science word. Pressure Force Area Fluids Archimedes principle Flooding Flying sinking. Tekanan Gaya Luas Zat alir Hukum archimedes Mengapung Melayang

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CAPTER 10 PRESSURE

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  1. CAPTER 10PRESSURE

  2. Basic Competency • To describe pressure on solids, liquid and gases and also its application in daily life

  3. Science word • Pressure • Force • Area • Fluids • Archimedes principle • Flooding • Flying • sinking • Tekanan • Gaya • Luas • Zat alir • Hukum archimedes • Mengapung • Melayang • Tenggelam

  4. Diagram concept

  5. After this you are able to : • Describe relation between pressure and area • Describe relation between pressure and force • Write down formula of pressure

  6. Pressure is defined as force acting on unit area If pressure (p), force (F), and area (A), we can write the formula below Pressure in solid

  7. The SI Unit of pressure is N/m2 or Pascal (Pa) The another unit such as Cm Hg, atmosfera (atm), Bar, dyne/cm2 Pressure in solid

  8. Fluids • How can a fluid produce pressure? • Pressure in fluid is produced by collisions between particles and the container.

  9. After this you are able to • Describe the quantities that have effect to pressure in liquid • Describe the characteristics of liquid pressure • Write down formula of hydrostatics pressure

  10. Pressure in Liquid • What do you feel when you dive into water? • Why did the engineer make dam have shape greater bottom?

  11. The characteristics of liquid pressure • Pressure in liquid increase with depth • Pressure at one depth equally in all direction • A liquid finds its own level in a U - tube • Pressure depend on the density of liquid.

  12. Formula of liquid pressure • For the information above, pressure of liquid just depend on 2 variable : • Depth (h), that have relation pressure ~ depth • Density () that have relations pressure ~ density

  13. Formula of liquid pressure • We can write formula : p ~ .h or p = .g.h which pressure (p), depth (h), density ( ), and gravitation (g)

  14. water alcohol Example • Alcohol has a density of 0.9 g/cm3. Water has a density of 1 g/cm3. At a depth of 40 cm which will have the greater pressure if they are both in open container ? • Calculate the pressure of liquid above. 40 cm

  15. Pascal’s principle • After this the student is able to • state Pascal’s Principle • applied Pascal’s Principle in daily life

  16. Pascal’s principle • Pressure applied to an enclosed liquid is transmitted to every part of liquid, whatever the shape of liquid.

  17. Aplication pascal’s principle • Pascal’s principle is applied in the operation of machines that use fluids to multiply force as in hydraulic lift

  18. Hydraulic system • In a hydraulic system fluid is confined in two connecting chambers. • Each chambers has a piston that is free to move.

  19. Pressure is transmitted throughout the fluid without change

  20. Example • A 50 newton force is exerted on the small piston a hydraulic system. The cross-sectional area of small piston is 0,05 m2. What is the magnitude of the weight that can be lifted by the large piston, which has a surface area of 0,2 m2?

  21. Archimedes Principle

  22. Archimedes Principle

  23. Archimedes Principle

  24. ???????? • What do you fell if you bring something in the water? • Why do it happen?

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