Properties of Air
Provide an example of how air can be compressed.
Various answers
What is an airplane's wing shaped like?
An airfoil.
What are the four forces of flight?
Lift, gravity, thrust, and drag.
Explain why the birds and dolphins have to adapt in their body.
Because the adaptations are needed for them in order to survive in their living environment.
Gravity
The force that attracts a body toward the center of the earth. or On the ground.
What would happen if you tried to blow up a balloon inside a water bottle? Which property of air does this demonstrate?
It would expand a little bit because the air in the bottle is taking up space, preventing the balloon from blowing up completely. Air takes up space.
What is Bernoulli's principle on the Lift?
The air pressure under the wing is higher than the air pressure over the wing. Higher pressure underneath pushes the wing up and produces lift.
Which two forces oppose each other?
Lift and gravity. or Thrust and drag.
What is the feature that dolphins and barn swallows have in their body? What shape is it?
Streamlined bodies.
Lift
An upward force the counteracts the force of gravity. or Goes up.
What would happen if there was a tin can in front of a lit candle and you blew air through straw towards the tin can. Which property of air does this demonstrate?
The air would flow around the tin can and the flame on the candle would go out. Air is a fluid.
What happened when you blow the air in between two balloon that we did in our experiment? And why?
They moved towards together. Because the fast moving air between the balloon creates an lover pressure outside.
If lift becomes greater than gravity, what will happen to the airplane?
The airplane will go ascend. (Go higher)
By flapping its wings. It will need to create drag. By tuck their wings behind their body.
Propulsion
The action of driving, flying or pushing forward.
How can we demonstrate that air exerts pressure?
Various answers
What are the two factors affect lift? (Bill Nye video mentioned)
Shapes of the wing and the angle of attack.
If drag becomes greater than thrust, what will happen to the airplane?
The airplane will decelerate. (Slow down)
What are the similarity between airplane and bird in the drag?
They both have to increase drag in order to slow down.
Thrust
Moving forward. or the force of a jet or rocket engine.
What are the 6 properties of air
Air takes up space. Air has mass/weight. Air affected by heat. Air exerts pressure. Air compressed. Air affected by altitude.
Is this statement Bernoulli's principle? " To generate lift, the wing must divert air down so that the plan can go up."
No. It's Newton's third law of motion.
Explain the relationship between the four forces of flight when an airplane is hovering.
Lift and gravity would be equal, and the thrust and drag would be equal.
What do birds do to decreasing drag? How about the aircraft?
The birds will tuck their wings when they are diving from high altitudes to lower altitudes. It cut right through the air. The aircraft will close their flaps to decrease the drag.
Drag
Its the force that acts opposite to the direction of motion. or Moving backwards.