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SESK: Stuff Everyone Should Know · sesk.info/aero-inertia-resists-change

What is inertia?

An object's tendency to resist a change in motion.

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  1. A force that always points upward
  2. A tendency to keep the same motion ✔
  3. Heat from a rocket nozzle

Why: An object at rest tends to remain at rest, and a moving object tends to continue steadily. An unbalanced force is needed to change that motion.

Huh, didn't know that: More massive objects have more inertia.

The dad joke
Inertia stayed home because it did not feel like changing state.
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References

Answer: A tendency to keep the same motion. An object at rest tends to remain at rest, and a moving object tends to continue steadily. An unbalanced force is needed to change that motion.

  1. Aerospace Dimensions Module 4, Rockets akwg.cap.gov/media/cms/Module_4__Rockets_6660F78F20B68_4ad77.pdf
    Inertia is the tendency of an object at rest to stay at rest and an object in motion to stay in motion.
    Checked 2026-10-10.

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