Short Answer
An object at rest stays at rest unless acted on by a net force is the best answer.
This concept lives inside the mechanics toolkit: forces, motion, energy, momentum, and rotation. The safest way to solve it is to name the governing law first, then connect the variables in units you trust.
Newton's first law is the law of inertia — objects maintain their state of motion unless a net force acts on them.
Why This Answer Is Correct
This is a Easy-level question in Classical Mechanics. The prompt is really testing whether you can connect the concept to its defining physical relationship instead of picking a nearby-but-wrong term.
Mechanics questions usually become easier once you identify whether the problem is about force balance, kinematics, energy, or conservation.
Choices At A Glance
- A. Objects always accelerate
- B. An object at rest stays at rest unless acted on by a net force
- C. Force equals mass times acceleration
- D. Every action has an equal and opposite reaction
When similar options appear on an exam, eliminate the ones that break the core law, use the wrong units, or confuse a definition with a consequence.
Topic Snapshot
Topic: Classical Mechanics
Difficulty: Easy
Best next move: Re-state the governing law in your own words, then solve one more example from the same topic before moving on.