(1390) PPGS Lesson 4.1 | Principles of Flight: Atmosphere & Newton's Laws of Motion

What is the composition of Earth's atmosphere?

The atmosphere is predominantly 80% nitrogen and about 20% oxygen.

What is standard atmospheric pressure at sea level in inches of mercury?

Standard atmospheric pressure at sea level is 29.92 inches of mercury.

What is the standard temperature at sea level in degrees Celsius?

The standard temperature at sea level is 15 degrees Celsius.

What happens to air pressure as altitude increases?

As altitude increases, air pressure decreases.

What is Newton's first law of motion?

A body at rest tends to remain at rest and a body in motion tends to remain in motion at the same speed and in the same direction unless acted upon.

What is the equation represented by Newton's second law of motion?

Force is equal to mass times acceleration (F=ma).

What does Newton's third law state?

For every action, there is an equal and opposite reaction.

What is Bernoulli's principle in relation to air flow?

As air accelerates through a constriction, its pressure decreases and its temperature drops.

What is the standard lapse rate for temperature change with altitude?

The standard lapse rate is 2 degrees Celsius per thousand feet.

What happens to air density as pressure increases?

The higher the pressure, the higher the density.

What is a venturi tube and how does it relate to Bernoulli's principle?

A venturi tube causes air to accelerate through a constriction, resulting in a drop in pressure and temperature.