1. CAPTER 10 PRESSURE

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

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

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. 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.
water
alcohol
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

21. 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?

22. Archimedes Principle

23. Archimedes Principle

24. Archimedes Principle

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