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Science preperation

Air and aerodynamics

What is Bernoulli's principle? Bernoulli's principle says that when air has a high velocity, it has a lower air pressure. (Opposite for the other way)
What are three adaptations you can find in animals? Birds - hollow bones - lighter to fly Birds - feathers - easier to fly - flows Air sack - provides through entire flight
What do airplanes use for thrust/propulsion? Birds? Insects? Birds and insects flap their wings, and run/jump. Airplanes and jets use engines.
How do insects fly? They have 2 pairs of wings. They flap in a figure 8. Wings curved on top, flat on the bottom.
What is streamlining? Streamlining is the shaping of an object to reduce the amount of drag and making it more aerodynamic.
How do jets achieve a forward motion? Take air in front of engine compressing it into small space - mixes with fuel - hot gasses - shot out of the back of the engine- cause plane to move in the opposite direction.
What is Newton's third law? For every action, there is an equal and opposite reaction.
What does oxygen do? It combines with other things in the environment, to make more things - oxygen makes some food turn brown - it combines with metals to rust. Oxygen is necessary for burning things - fire.
How do fire extinguishers work? They cut off the burning substance from air. Fire extinguishers have carbon dioxide in it - gets rid of the oxygen in the fire. Extinguishing the fire.
What produces carbon dioxide? Humans and animals exhale carbon dioxide.
What properties does air have? It can exert pressure. It can be compressed. It takes up space. It has mass. It can be affected by temperature.
Why does warm air rise? The molecules in warm air expand - making it less dense and easier to rise.
What is mass? Mass is a body of matter that takes up space and has weight.
What does it mean when someone says air is a fluid? Air can be a liquid or a gas.
What is density? It is a measure of how closely the molecules are packed together.
What happens when air is heated? The molecules start to move faster making it expand - taking up space.
What happens when air gets cold? The molecules move slower and the density increases.
What happens to air when it is compressed? The molecule that make up air are forced together. Air in tires are forced or squeezed in a confined space.
How does temperature affect molecules? Hot air make the molecules move fast - expand and rise. Cold are makes them move slower - densify.
What are three states of matter? Solid, liquid, gas.
What is air made up of? 78% Nitrogen 21% Oxygen 1% Others
What are the four forces of flight? Thrust, lift, drag, weight/gravity.
What is lift? Lift is an upward force that acts against gravity. This force keeps an object in the air. A plane gets its lift from different pressures in the air acting on the wing.
What is drag? Drag is the opposite of thrust. It is the force restrains the moving object.
What is gravity? Gravity is the opposite to lift. It is the natural downward force that pulls things towards the earth.
What is thrust? Thrust is the opposite of drag. Thrust is the force that moves planes and animal in the direction of motion. The engine on a plane gives the plane thrust.
How do wings work? The shape helps to achieve lift. The top is curved and the bottom is flat. Air travels over the top of the wing creating a difference in pressure.
Created by: 59097502
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