A
Air is considered a _________________
Fluid. It flows just like water.
These air molecules are packed more tightly together and are more dense.
What are cold air molecules.
You cannot see it, another way of saying this is that air is....
What is invisible.
Cold air sinks, warm/or hot air does this...
What is rises
The 4 forces are Lift, Gravity/weight and these 2 forces...
What are thrust and drag
Name 2 lighter than air flying devices
What are hot air balloons
zepplins, airships, blimps, dirigibles
Another property of air is that it is made up of ....
What are different particles or many gases
The special name of the shape that a wing has.
What is an airfoil.
Finish this sentence.
For every action, there is
An equal and opposite reaction.
What was a con of using hydrogen in airships?
Flammable and explosive
Fast moving air exerts this on what it is passing over.
What is less pressure
A bird's wing in flat on the bottom and _________ on the top.
What is convex or curved.
To achieve lift, you have to overcome this force.
What is gravity.
Isaac Newton's Third Law of Motion states a force is anything that can change the state of motion of an object like a ____ or ________
What are a push or a pull.
The rudder is used to move the plane left or right. This is called...
What is yaw
Ailerons move the opposite direction to create uneven lift across the wings, this causes the plane to....
What is roll or turning
Name one of the control surfaces a pilot uses to steer an aircraft.
What are rudder, ailerons, or elevators
One of the properties of air is that is exert this, on all around it.
What is pressure
Slow moving air exerts this on what it is passing over.
What is high pressure
Elevators create unbalanced forces that cause a plane to go up or down, this is called...
What is pitch.
To describe force, we use __________ and __________
What are direction and strength
If lift is more that weight, then this will happen
An object can stay in the air or fly
Airplanes, Birds and this device achieve flight.
What are helicopters
We tried to blow up a ballon in a bottle and couldn't. This was because air....
What is takes up space
What adaptations do birds have that helps them to fly?
What is wing shape.