1. Liquids Definite volume but no definite shape!

2. Liquids Pressure Buoyancy Archimedes’ Principle Density Effects Pascal’s Principle

3. Pressure Pressure is the quotient of force exerted and the area over which it occurs. P = F/A Pressure can also be thought of as the density of a fluid acting at a certain depth. P = weight density X (depth) Both equations have units of N/m 2 = Pascal (Pa)

4. Pressure Total Pressure = Wt. Density X Depth + atm.press Pressure of liquid does not depend on amount of liquid, only its depth and wt. density. Pressure does not depend on the shape of the container.

5. Buoyancy A fluid (gas and/or liquid) will exert a force on a submerged object. –There is a net upward force - buoyant force This buoyant force depends on the wt. density of the fluid and the volume of the object submerged.

6. Buoyancy When the weight of a submerged object is greater than the buoyant force, the object will sink –if the weight is less, object will float –if the weight is equal, object will neither float nor sink.

7. Buoyancy It turns out that the volume of fluid displaced by the object is equal to the volume of the object!

8. Archimedes’ Principle An immersed object is buoyed up by a force equal to the weight of the fluid it displaces! W apparent = W in air - F buoyant Immersed - either completely or partially submerged

9. Because of this... If an object has a density < the density of the fluid it is immersed in, it will ____________. If the object has a density > the density of the fluid it is immersed in, it will ____________. Ans. Float ; Sink

10. Principle of Flotation A floating object displaces a weight of fluid equal to its own weight. The volume of a submerged object is equal to the of liquid displaced. The weight of a floating object is equal to the of liquid displaced. Ans - volume, weight

11. Pascal’s Principle Blasé Pascal noticed that when a pressure was exerted on an enclosed fluid, the pressure was transmitted undiminished to all points in the fluid and acted in all directions. Thus, liquids are incompressible, and they can be used to do work...

12. Applications of Pascal’s Principle Hydraulics Pneumatics Examples…

14. Archimedes’ Princ. Lab In this lab we will measure the buoyant force and volume of several object submerged in water.