Av2 - U4 - Exam

Front

Forces are vectors because __________.

Back

they have magnitude and direction.

Front

Which best describes Newton’s Third Law of Motion?

Back

For every action there is an equal and opposite reaction

Front

Lift on a wing is most properly defined as the ____________.

Back

force acting perpendicular to the relative wind

Front

True or False. The reaction of downwash causes a downward reaction according to Newton’s Third Law of Motion.

Back

False

Front

Which of the following is true for an airplane in steady flight?
The sum of all upward components of forces equals the sum of all downward components of forces. Additionally, it applies for forward components of forces of backward components.

Back

The sum of all upward components of forces equals the sum of all downward components of forces. Additionally, it applies for forward components of forces of backward components.

Front

Which of the following is true relative to a changing angle of attack? A decrease in angle of attack will increase the pressure below the wing and increase drag; An increase in angle of attack will decrease the pressure above the wing and increase lift; An increase in angle of attack will increase the pressure above the wing and increase drag; An decrease in angle of attack will increase lift.

Back

An increase in angle of attack will decrease the pressure above the wing and increase lift.

Front

What is the problem with the Longer Path theory (or Equal Transit Time theory) regarding air molecules over a wing? Hint: It assumes that molecules of air arriving at the front of the wing at the same time must also arrive at the back edge of the wing at the same time. 

Back

It assumes that molecules of air arriving at the front of the wing at the same time must also arrive at the back edge of the wing at the same time. 

Front

The __________ of an airplane can act as an airfoil by helping to produce stability and lift.

Back

fuselage

Front

Increasing an airplane’s wing area will __________.

Back

increase lift and drag

Front

If the velocity of an airplane is doubled, the lift will _________.

Back

increase by a factor of 4