What characterizes a non-inertial reference frame?

Answer

It is accelerating (speeding up, slowing down, or rotating)

A non-inertial reference frame is any system undergoing acceleration, which includes speeding up, slowing down, or rotating.

What characterizes a non-inertial reference frame?

#Videos

What are frames of reference in physics? - YouTube

Reference Frames - YouTube

Definitionconceptsystemframe