![]() Its dimensions are mass/time (kg/sec, slug/sec, …) and it is equal to the density r times the velocity V times the area A. Mass flow rate is the amount of mass moving through a given plane over some amount of time. For a moving fluid, the important parameter is the mass flow rate. But if we are dealing with a fluid (liquid or gas) and particularly if we are dealing with a moving fluid, keeping track of the mass gets tricky. If we are dealing with a solid, keeping track of the mass is relatively easy the molecules of a solid are closely bound to each other and a solid retains its shape. If we keep the mass constant and just change the velocity with time we obtain the simple force equation – force equals mass time acceleration a F = m * a Mass Flow Rate So, between two times t1 and t2, the force is given by: F = ((m * V)2 – (m * V)1) / (t2 – t1) Force Momentum is the object’s mass m times the velocity V. Momentumįrom Newton’s second law of motion, we can define a force F to be the change in momentum of an object with a change in time. For right now, let us just think of the propulsion system as some machine which accelerates a gas. We will discuss the details of various propulsion systems on some other pages. To accelerate the gas, we need some kind of propulsion system. A gas or working fluid is accelerated to the rear and the engine and aircraft are accelerated in the opposite direction. ![]() Thrust is a mechanical force which is generated through the reaction of accelerating a mass of gas, as explained by Newton’s third law of motion. Thrust is generated by the propulsion system of the airplane. Thrust is the force which moves an aircraft through the air. Home > Beginners Guide to Aeronautics Thrust Equation
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