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PRODUCTS OF INERTIA APPLICATIONS
The concepts of rigid body or particle dynamics are used in engineering when motion is involved. This can be motion of a fluid element, a controller such as a flap or landing gear mechanism, and trajectories of vehicles.
It is important that the principles of dynamics are well understood by engineers. An engineering problem can be thought of as a word problem, similar to word problems solved in mathematics. Dynamics provides the basics by which the equations of motions that govern the problem can be derived and applied.
The products of inertia are useful for calculations done in different coordinate systems that involve rotation and can be used to determine more information about the rotating body, such as the displacement, velocity and acceleration of the rotating body, as well as applied moments.