Technology Interactions
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Chapter 10: Flight
      
  1.Two forces that oppose motion are  
  a.   gravity and friction.  
  b.   gravity and mass.  
  c.   friction and mass.  
  d.   friction and thrust.  
      
  2.Which of the following best describes the effect of drag on an aircraft?  
  a.   It provides that force needed by an aircraft to overcome friction.  
  b.   It provides the lift needed by an aircraft to overcome gravity and allow the aircraft to fly.  
  c.   It is the force of fluid friction on the aircraft and can be reduced by making air flow more smoothly over the surface of an aircraft.  
  d.   It is equal to the mass of the aircraft multiplied by acceleration of the aircraft due to gravity.  
      
  3.Which part of an airplane is an example of an airfoil?  
  a.   landing gear  
  b.   rudder  
  c.   wings  
  d.   elevators  
      
  4.Newton's third law of motion states that  
  a.   for every action there is an equal and opposite reaction.  
  b.   the change of motion is proportional to the amount of force acting on the body.  
  c.   a fast-moving fluid exerts less pressure than a slow-moving fluid.  
  d.   a body will remain at rest unless a force acts on it.  
      
  5.The forward force that allows planes to fly is  
  a.   lift.  
  b.   friction.  
  c.   thrust.  
  d.   inertia.  
      
  6.A helicopter hovers in one spot when  
  a.   the rotor blades are moved forward.  
  b.   the rotor blades produce only enough lift to match the weight of the helicopter.  
  c.   engine speed matches rotor speed exactly.  
  d.   the rotor blades are moved backward.  
      
  7.Jet engines work on which of the following principles?  
  a.   Einstein's theory of relativity  
  b.   Newton's first law of motion  
  c.   Newton's second law of motion  
  d.   Newton's third law of motion  
      
  8.The propeller on an airplane works by  
  a.   creating low pressure areas in front of the propeller.  
  b.   reducing the air pressure above the wing of the plane.  
  c.   exerting high pressure on the air in front of the airplane.  
  d.   creating thrust.  
      
  9.One of the goals of aerodynamics is to design objects such as airplanes and cars to reduce the effects of  
  a.   fluid friction.  
  b.   thrust.  
  c.   elevation.  
  d.   gravity.  
      
  10.What forces help objects overcome gravity and friction?  
  a.   lift and drag  
  b.   lift and thrust  
  c.   inertia and thrust  
  d.   drag and thrust  

 
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