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Newton First Law of Motion applied to Flight of Airplane

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First Law of Motion-

First Law of Motion states that every object stays in its state of motion ( rest or motion ) and moves with a uniform velocity, until an external force is applied.


When moving at constant altitude-

If thrust and drag are equal , airplane moves at constant speed

If thrust is increased-

Aircraft accelerates-airspeed increases 


Drag depends on airspeed-Drag increases 


When drag is again equal to thrust-

Aircraft no longer accelerates but hold a new,higher,constant speed




The key point here is that if there is no net resulting force from unbalanced force acting on an object , then the object maintains a constant velocity. If that velocity is zero , then object remains at rest .
And if additional external force is applied the velocity changes beacause of force.


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