1. Chapter 13
13.1 Fluid Pressure

2. -250C at warmest Pressure Review Charles’ law
Pressure increases as temperature increases.
Boyles’ law
Pressure decreases as volume increases.
-250C at warmest

4. P=F/A Pressure Pressure = force ÷ area Force should be in newtons (N).
Area should be in square meters (m2).
The SI unit for pressure is a pascal (Pa) or N/m2.
P=F/A
Pascal

5. Pressure
A box weighs 2700 newtons. It is covering an area of 1.5 square meters. What pressure does the box exert on the ground?
P = F/A
P= 2700 N/1.5 m2
P = 1800 Pa

6. Why does the pressure washer have high pressure?

8. Pressure in Fluids
The pressure in a fluid at any given depth is constant, and it is exerted equally in all directions.

9. Pressure in Fluids
Water pressure increases as depth increases.

12. Air pressure decreases as the altitude increases.

14. Pascal’s Principle
According to Pascal’s principle, a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid.

17. Hydraulic Systems
In a hydraulic lift system, an increased output force is produced because constant fluid pressure is exerted on the larger area of the output piston.

18. Bernoulli’s Principle
According to Bernoulli’s principle, as the speed of a fluid increases, the pressure within the fluid decreases.
This is the principle that explains why airplanes fly.

20. The buoyant force acts against gravity.
Buoyancy
Buoyancy results in the apparent loss of weight of an object in a fluid.
The buoyant force acts against gravity.

21. Density and Buoyancy
If an object is less dense than the fluid it is in, it will float.
If the object is more dense than the fluid it is in, it will sink.
When the buoyant force is equal to the weight, an object floats or is suspended.
When the buoyant force is less than the weight, the object sinks.

22. Archimedes Principle
a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid
Explains buoyancy

23. Why are water towers built on hills?