Generic propulsive device (jet engine, propeller, etc) whose function is to produce thrust, T, acting towards the left.
Regardless of type of device, the thrust exerted on the deviceis the net resultant of pressure and shear distributions, at points where air contacts device (internal and external)
Airexperiences equal and opposite reaction (Newton’s 3rd Law) to thrust
Air is accelerated to velocity Vj, called the jet velocity
Newton’s 2nd Law:
the force on an object is equal to the time rate of change of momentum of that object
(Note: we are neglecting the pressure force on the stream tube for this simplified
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