1. U3f - L1 Copy the sentences in your notebook. Fill in the blanks using the terms below: 1._______ is how much space an object occupies. 2._______ is a force applied over an area. 3._______ is a system in which no fluid can enter or leave. March 23, 2011 DRILL Pressure Closed System Volume3.1.2.

2. U3f - L1 UNIT 3 – Engineering Design Engineering, the systematic application of mathematical, scientific, and technical principles, produces tangible end products that meet our needs and desires.

3. U3f - L1 UNIT 3 – Engineering Design a.Getting familiar with the Big Idea b.The Design Process c.Core Technologies d.Mechanical Technology e.Electrical Technology f.Fluid Technology g.Thermal Technology h.Optical Technology i.Materials Technology j.Reverse Technology

4. U3f - L1 Fluid Technology PURPOSE OF SUB-UNIT To familiarize students with the functioning and applications of fluid technology systems.

5. U3f - L1 Fluid Technology What is technology? The application of knowledge, tools, and skills to solve problems and extend human capabilities. What is a technology system? A Technology System is a group of subsystems working together to solve problems and extend human capabilities.

6. U3f - L1 There are several engineering resources (core technologies) that are the “building blocks” of all technology systems. We could store the core technologies on shelves We can go to those shelves and use technologies according to our needs in problem solving. Fluid Technology Core Technologies Mechanical StructuralElectrical ElectronicThermal FluidOptical Bio-TechMaterial

7. U3f - L1 The technology of using fluid, either gas (pneumatics) or liquid (hydraulic) to apply force or to transport. Example applications: Air brakes on a truck, Tires on a car, Airfoils on an airplane, Warm-air heating ducts, Hydraulic jack, Plumbing in a school Hydro-electric dam What is Fluid Technology?

8. U3f - L1 Blood flow in capillaries (only a few micro-meters in diameters) Crude oil across Alaska through 800-mile-long, 4-ft diameter pipe Streamlined, smooth surfaces of airplanes for efficient air flight Dimpled, rough surfaces of golf balls for efficient flight Why does a stream of water from a faucet sometimes appear to have a smooth surface, but sometimes a rough surface? How does aerodynamic design of cars and trucks affect gas mileage? Other applications of Fluid Technology…

9. U3f - L1 College engineering text definition: –a substance that deforms continuously when acted on by a shearing stress of any magnitude Standard definition: –a substance (as a liquid or a gas) that conforms to the outline of its container Fluid Systems have 2 things in common: –They contain a fluid, either gas (pneumatics) or liquid (hydraulics) –They contain a pressure difference that creates a net force What is a FLUID?

10. U3f - L1 Area – a surface within certain boundaries –Typically 2-dimensional Volume – the amount of space an object occupies –3-dimensional Force – a push or pull Pressure – a force applied over an area FLUID PRINCIPLES What is the area of the portion of this piece of lumber that sits on the floor? (Convert all units to inches first) 4” x 12” = 48 square inches What is the total volume of this piece of lumber? (Convert all units to inches first) 48” x 2” = 96 cubic inches Your teacher stands on this piece of wood on the floor. What is the pressure applied to the floor beneath the wood?

11. U3f - L1 Pressure is a force applied over an area. What are some typical units for pressure? –Psi (pounds per square inch) Pressure = Force / Area FLUID PRINCIPLES A = 48 square inches Your teacher (weighing 165 pounds) stands on this piece of wood on the floor. What is the pressure applied to the floor beneath the wood? F = 165 lbs. P = F / A P = 165 lbs / 48 in 2 P = 3.44 psi

12. Enjoy your night off from Engineering homework! U3f - L1