I have heard of frame of reference in the context of mechanics. I have a question in my mind regarding that.

Is there a frame of reference in which the sum of forces on a body is zero but acceleration is non-zero? Is the converse also true?

Please give examples to illustrate. Thanks in advance...

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## Comments

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TopNewestObviously, when the frame of reference is accelerating , then it would observe the body (on which the sum of forces is zero) as accelerating. But it does not violate the Newton's laws of motion, as a pseudo force or fictitious force force is added in this case, which is thought to have been accelerating the body. Even the converse, is true. if the frame of reference is accelerating at the same rate as that of the body. The concept of fictitious force also applies here.

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