Newton's First Law and Inertia MCQs
Practice Newton's First Law and Inertia multiple-choice questions from How Forces Affect Motion (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Newton's First Law and InertiaQuiz - Solve & Score
Q1. Which is described: 'a body keeps its state unless a net force acts'?
- A.Newton's first law
- B.Inertia of rest
- C.Inertia of motion
- D.Inertia of direction
Answer: A. Newton's first law
NCERT fact (physics, chapter 'How Forces Affect Motion'): Apply Newton's second law F = m * a, linking force, mass and acceleration; substituting the given numerical values into this relation => the unknown reduces to a single number; hence the required answer = Newton's first law. Why option A fits - Correct. Distractor analysis: option B) 'Inertia of rest' is incorrect: Inertia of rest: tendency to remain at rest; option C) 'Inertia of motion' doesn't hold - Inertia of motion: tendency to keep moving uniformly. Final answer - A) Newton's first law.
Q2. Which is described: 'tendency to resist a change in state of motion'?
- A.Inertia
- B.Inertia of motion
- C.Inertia of direction
- D.Mass
Answer: A. Inertia
Q3. Which is described: 'tendency to remain at rest'?
- A.Inertia of rest
- B.Inertia of direction
- C.Mass
- D.Seat belt
Answer: A. Inertia of rest
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