“In motion” is a standard English phrase meaning moving or active. “Of motion” is mainly used in technical or formal expressions such as “laws of motion.”
Use “in motion” to describe something that is moving or active. Use “of motion” only in specific combinations such as “equations of motion” or “laws of motion.”
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use “in motion” for something moving physically or for a process that has started.
Use “of motion” in fixed scientific phrases.
In meetings, “motion” often takes “to” plus a verb.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
For everyday movement, English normally uses “in motion.”
✕ The car was of motion. ✓ The car was in motion.Scientific expressions often require “of motion.”
✕ Newton's laws in motion ✓ Newton's laws of motionChoose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. It can describe a process that has started, such as “set the plan in motion.”
No. It mostly appears in technical, scientific, or formal expressions.
It means to start a process or cause something to begin.
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