1. Chapter 11, Sections 1 & 2 Pressure!!

2. What is Pressure??? Pressure is related to the word Press. Pressure=Force/Area A Barometer is used to measure Pressure. Your feet exert pressure on the ground. –The amount of Pressure you exert depends on the area over which you exert a Force. –Pressure is measured in Pascals.

3. Fluid Pressure In a fluid, all of the forces exerted by the individual particles combine to make up the pressure exerted by the fluid. Figure 4, pg. 419

4. Air Pressure Did you know air is considered a fluid? Air exerts Pressure because of its mass. You are holding up air when you hold out your hand. Balanced Pressure is the same as a balanced force, the downward pressure is equal and opposite the upward pressure. Look at figure 5, pg. 421

5. Density Remember, Density is an object’s mass per unit volume. Density=mass/volume By comparing Densities, you can predict whether an object will float or sink in a fluid. Changing Density can explain why an object floats or sinks. Figure 7, pg. 425

6. Buoyancy The ability to float. The Buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter. Figures 8-12, pg.’s 426-429