Properties of Air
Air always exerts (presses) ____________.
Pressure
Which direction does drag work?
The opposite direction.
What is the best/ideal shape for a wing?
Airfoil Shape
What are two forces that work against things that fly?
A) Drag, Lift
B) Lift, Thrust
C) Gravity, Drag
D) Gravity, Thrust
C) Gravity and Drag
Who invented the first successful flying airplane?
The Wright Brothers
Air ______ _____ against everything. It never stops _________.
Air presses hard against everything. It never stops pressing.
What is gravity?
An invisible force that pulls objects down to earth.
What is Newton's First Law?
Every object will remain in a state of motion unless an external force is applied to it.
What are two forces that always work with living/non-living things to fly?
A) Lift, Drag
B) Lift, Thrust
C) Drag, Gravity
D) Gravity, Lift
B) Lift and thrust
Name 2 positive things that planes have contributed to in our society.
ex. short travel times, vacation in different parts of country and world, visit family across the world, move to different parts of world, transport food/goods, travel for business
Air tends to flow from areas of LOW pressure to areas of HIGH pressure.
TRUE or FALSE
FALSE.
Air tends to flow from high pressure to low pressure areas.
What is an example of thrust on an airplane?
Jet engines and propellers.
Give an example of Newton's Second Law.
(Acceleration is produced when a force acts on a mass.)
Name 3 things that help living things fly.
Name 3 negative things that have impacted our society because of airplanes.
ex. fast lifestyle (impatient), pollution from planes (fuel), destroying ozone layer by burning fuels, plane/helicopter accidents
The _________ you go away from the surface of Earth, the ___________ the air pressure.
The farther you go away from the surface of Earth, the lower the air pressure.
How does a plane depend on lift (an upward force) to fly?
Planes need to have airfoil shaped wings to create an angle of attack in order to achieve flight.
a) What is Newton's Third Law?
b) What is the Law of Flight?
a) For every action there is an equal and opposite reaction.
b) Air particles always travel from high pressure to low pressure areas.
Name 3 things that help planes fly.
thrust, angle of attack, airfoil shaped wings, engine
Is flying by plane equal for everyone?
No. Travelling by plane can be very expensive. Not everyone can afford to travel by plane even though it is faster to travel.
Explain the difference between mass and weight.
Mass is the amount of matter in an object. Weight is the force of gravity pulling on an object. Mass stays the same and weight will be different if compared on earth and on the moon.
Fast moving air has __________ air pressure than slow moving air.
lower
What is Bernoulli's Principle?
As the speed of fluid (example: air) increases, the pressure decreases.
Explain how an air balloon achieves flight.
Uses hot air to float through surrounding cooler air. Hot air is lighter than cool air.
Do you think planes were a good invention over all?
Yes/no