1. Bell Ringer 2-19-10 What is the formula for pressure?
What place on earth is there the greatest pressure? The least pressure?
What is the SI Unit for density?
What causes your ears to pop when going up in a airplane or swimming towards the bottom of a swimming pool?
If an object floats, it is (less, more) dense than the fluid it’s in.

2. Videos
Titanic

3. Chapter 11
Sections 3 and 4

4. Pascal’s Principle

5. Pascal’s Principle
Pascal’s Principle states when force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.
P. 389

6. Using Pascal’s Principle: Figure 15

7. Hydraulic System
Hydraulic system is a system that multiplies force by applying the force to a small area.
The increase in pressure is then transmitted to another part of the confined fluid, which pushes on a larger surface area.
Pressure = F Larger force
a larger area

8. Bernoulli’s Principle
Bernoulli’s Principle is the rule that a stream of fast-moving fluid exerts less pressure than the surrounding fluid.

9. Examples
Airplane flying
Chimney
Frisbee flying through the air

10. Fluids move from areas of higher pressure to areas of lower pressure.
Higher  Lower
Pressure Pressure

11. Lift is an upward force.