What is the difference between inertial frame and non-inertial frame?
An inertial frame moves at constant velocity (Newton's laws hold directly); a non-inertial frame accelerates (you must add pseudo-forces).
An inertial frame moves at constant velocity (Newton's laws hold directly); a non-inertial frame accelerates (you must add pseudo-forces). A reliable way to keep them apart is to focus on what each one is defined by, not just the similar-sounding words.
Key point
inertial frame vs non-inertial frame
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