Describe two adaptations that birds have for flight.
Various answers
100
How can we reduce drag?
Streamlining
200
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.
200
State Bernoulli's Principle.
As the speed of a fluid increases, the pressure exerted by that fluid decreases.
200
Which two forces oppose each other?
Lift and gravity. Thrust and drag.
200
Describe two adaptations that insects have for flight.
Various answers
200
Which two gases make up most of air?
Nitrogen and oxygen
300
What would happen if there was a tin can in front of a lit candle and you blew air through a 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.
300
What would happen if you blew between two pop cans that were placed a couple centimetres apart? Why would this happen?
They would move towards one other. This happens because the fast moving air between the cans creates an area of low pressure, while the air on the outside of the cans exerts high pressure.
300
If lift becomes greater than gravity, what will happen to the airplane?
The airplane will ascend (go higher).
300
Describe an adaptation that both birds and insects have for flight.
Various answers
300
What would happen if you lit a candle and put a glass jar over top of it? Why would this happen?
The candle would eventually go out because the act of combustion (burning) would use up all of the oxygen.
400
How can we demonstrate that air exerts pressure?
Various answers
400
Which two factors affect lift?
Shape of the wing and the angle of attack.
400
If drag becomes greater than thrust, what will happen to the airplane?
The airplane will decelerate (slow down).
400
Describe one difference between bird and insect adaptations for flight.
Various answers
400
How does an aircraft generate thrust?
Propeller or jet engine
500
What are the 5 properties of air?
Air takes up space. Air has mass. Air exerts pressure. Air is a fluid. Air can be compressed.
500
Explain how Bernoulli's Principle provides an airplane with lift.
The air moves faster over the top of the wing than the bottom. This creates an area of low pressure on the top of the wing and an area of high pressure on the bottom of the wing, resulting in lift.
500
Explain the relationship between the four forces of flight when an airplane is hovering.
Lift and gravity would be equal, and thrust and drag would be equal.
500
How does a bird generate thrust?
By jumping, flapping its wings, and/or running
500
Explain what oxidation is.
Oxidation is rusting. It occurs when oxygen in the air reacts with the chemicals on the surface of an object. The oxygen replaces the other substances and gives off a brownish colour.