Forces, Flight Descriptions and Questions

Diagram

Questions

What are the four forces that act on an airplane in flight? In what year did Isaac Newton present his three laws of motion? Which forces were left out of the diagrams at the top of the page? Which direction do they point?What force must balance the weight of the aircraft in order for the plane to y at a constant altitude? Unlike sliding friction, drag forces are velocity dependent. What type of mathematical relationship exists between drag force and velocity? If you doubled the speed of an aircraft, what would happen to the drag force? How much net force is needed to keep the airplane moving forward at constant speed? What will the acceleration of an airplane be if the thrust force is equal to the drag force