Presentation on theme: "Air and space technologies rely on aerospace— the study of how things fly. Technology Interactions."— Presentation transcript:
1Air and space technologies rely on aerospace— the study of how things fly. Technology Interactions
2To Fly Like a BirdHumans tried using feathers and wood to construct wings like a bird’s.Humans don’t have the muscle power and hollow bone structure to fly like birds.Humans learned to use technology to fly.
3What Makes Things Fly?An object will not change speed or direction unless a force acts on it.Thrust is a forward force.Lift is an upward force.Fluid friction, or drag, slows down a moving object. Gravity pulls objects toward earth.Momentum is the connection between how fast an object is moving and the mass of the object.
4Thrust On jet airplanes, thrust is created by the plane’s engines. On propeller planes, engines make the propellers spin, creating thrust.
5LiftThe Bernoulli effect: a fast-moving fluid exerts less pressure than a slow-moving fluid.Airfoil: a shape designed to produce useful motion from the flow of air.Wings and propellers are airfoils that help create lift.
6Controlling Propeller Airplanes Ailerons make the plane roll from side to side.
7Controlling Propeller Airplanes The rudder makes the plane turn left or right.
8Controlling Propeller Airplanes Elevators make the plane dive and climb.
9Jet EnginesJet engines use Newton’s third law of motion: for every action, there is an equal and opposite reaction.
10Rockets Rockets use Newton’s third law of motion. Rockets carry their own oxygen with them so they can operate in space.The nozzle at the base of a rocket’s engine can swivel to direct the hot gases in different directions, allowing the rocket to change direction.Rockets are powered by solid fuel boosters or liquid fuel boosters.
11Solid Fuel Boosters Solid fuel boosters contain a solid propellant. Once solid fuel is ignited, it must burn completely.
12Liquid Fuel BoostersLiquid fuel boosters burn liquid hydrogen and oxygen.Liquid fuel engines can be turned on and off.