NS2-M3C18 - Motion, Force, and Aerodynamics Quiz 57

Who observed that in the absence of friction, an object in horizontal motion continues to move at the same speed with no additional force?

• Einstein

• Newton

• Galileo

• Aristotle

Which one of Newton’s Laws of Motion cannot be demonstrated in a typical setting on Earth due to friction and gravity?

• First

• Second

• Third

• All of the above

• None of the above

Bernoulli’s principle states that since the total energy in a closed system varies, if one element in a fluid system is decreased, another must increase to counterbalance it.

• Change “increased” to “decreased”

• Change “varies” to “is constant”

• Change “decreased” to “increased”

• No changes are needed

Which of the following can be done to reduce the effects of shockwaves and sonic booms on supersonic aircraft?

• decrease thickness of wings

• decrease the length of the nose

• increase wingspan

• sweep wings back

Slight increases in the angle of attack of an airfoil (wing) will normally cause

• an increase in speed due to the faster airflow over the top surface

• an increase in drag thus slowing the aircraft to the point of losing lift

• a decrease in lift due to the longer path of airflow over the wing

• an increase in lift due to the longer path of airflow over the wing

The vector sum of all the forces acting on an object; also called resultant force

• Net force

• Joules

• Shock wave

• Sonic boom

The condition of unrestrained motion in a gravitational field

• G force

• Free fall

• Gravity

• Energy

That component of the total aerodynamic force exerted by the air on an airfoil, having a direction opposite to the force of gravity, enabling an aircraft to stay aloft.

• Lift

• Push

• Drag

• Thrust

A disturbance that occurs when an object reaches the speed of sound or greater, and pressure waves in front of and behind the object are forced together and compressed.

• Sonic boom

• Sonic wave

• Shock wave

• Doppler effect

Change in velocity per unit of time is called what?

• The theory of relativity

• Newtonian motion

• Acceleration

• Aerodynamics