A proper frame, or comoving frame, is a frame of reference that is attached to an object. The object in this frame is stationary within the frame, which is useful for many types of calculations.
For example, a freely falling elevator is a proper frame for a free falling object in the elevator, while the surface of the Earth is not.
Proper frames can be inertial as well as non-inertial as in the example above.
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Famous quotes containing the words proper and/or frame:
“Its proper use is to amuse the idle, and relax the studious, and dilute the full meals of those who cannot use exercise, and will not use abstinence.”
—Samuel Johnson (1709–1784)
“Faith, I have been a truant in the law,
And never yet could frame my will to it,
And therefore frame the law unto my will.”
—William Shakespeare (1564–1616)