Av2 - U3 - Sa - L1 / L2 - Quiz

When an object moves through a fluid, which of the following will affect fluid friction? Select all that apply. (3.A.1) 

• The fluid's color

• The fluid's viscosity, speed of the object, and the shape of the object

• The fluid's pH and vertical stabilizer

• The object's density

An airfoil’s movement through air is similar to _______.  (3.A.1)  

• a moving freight train

• a boat’s movement on water

• a beam of light

• electron flow through a wire

True or False. Water has greater viscosity than air.  (3.A.1)

• True

• False

True or False: Fluid friction is friction that is created by the resistance to motion between a fluid and an object. (3.A.1)

• True

• False

The Coanda Effect is the tendency of a stream of fluid to _______ .  (3.A.1)

• avoid a moving object

• move below an airplane’s wing

• attach to a convex surface

• go around a wing or rotor

Which of the following are factors that affect air density? (3.A.2)

• Humidity, pressure, and temperature

• Viscosity and Velocity

• Friction and Velocity

• Butterfly Effect and Pure Magic

Millibars (mb) is a unit of measurement for _______ .  (3.A.2)

• air temperature

• density

• atmospheric pressure

• fluid friction

True or False: Air density increases as altitude increases. (3.A.2)

• True

• False

Briefly explain why two substances with the same volume can have different densities. Give an example.  (3.A.2)  

Which of the following statements about air density are true? Select all that apply.  (3.A.2)

• Air density and air pressure are inversely proportional.

• As temperature increases, so too does density.

• Temperature is inversely related to air density.

• Humid air is less dense than dry air.