Introductio to AeroSpace 03

OPENING QUESTION:  We can generally describe 4 fources acting on an airplance in flight.

  1. List them
  2. Imagine that you are on a flight from Seattle to New York. You're about 30 minutes from New York and you suddenly feel the plane slow down. Sketch the forces acting on that plane at that time (Hint: Bigger arrows mean bigger forces, smaller arrows mean smaller forces)

LEARNING GOAL FOR TODAY: I will be able to show that weight depends on mass and gravity during today's class.

I will be able to sketch how lift pulls an airplane upward during today's class.


  • Force: ("A push or a pull")
  • Thurst ("forward pushing force")
  • Air Friction ("resists forward motion")
  • Lift ("Lower pressure, upward pull")
  • Weight ("downward pull")



Let's take a quick gander at our handbook lesson for pd 5:


We covered a LOT of material yesterday, so we'll make sure to get a good review of that today. Let's start by weight. We don't often think of weight as a force but our weight is what keeps on the surface of planet Earth.

With that in mind, sketch the forces acting on a person about my size (185 lbs or so).

Now sketch me on the moon (gravity = 1/6 Earth)

Now sketch me on Mars (gravity = 1/3 Earth)

What do you notice about my weight?

But I'm still the same person, how can that change?


Now let's take a gander at the weight of air molecules... why do we care?


Recall that the air above us and all around us is essentially billions x billions x billions of individual air molecules:

Each of those bubbles has a mass.

Gravity works on each of those bubbles so each of those bubbles has *weight*

Stacked up on top of us we say that those bubbles cause *air pressure* of about 14.7 pounds on each square inch of us!


Sketch an airplane wing.... what about the shape of that wing causes MORE air to move over the wing and less to move under the wing.

Why is that critical for generating lift?



Let's say you are building a model airplane and it falls out of the sky very quickly, what might you do about that? (hint hint: see above!)

1) Who was the first person to fly across the Atlantic? (which decade?)

2) SR71: Why is it significant?

3) Boeing 707 first flown by airlines in the 1960's... why is that significant?

4) This rocket plane flew faster than the speed of sound for the first time. Which decade?

5) Mitsubish fighter flew during WWII (1940's) why was it significant?

6) When did the Wright Brother's flier first prove that human controlled flight was possible?