Class 9 - Physics - Chapter 1
Whole Book • 14 marks • 90 min • medium • draft
Section A — MCQs
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Which law states that an object at rest stays at rest unless acted upon by a net external force, and is also known as the law of inertia?
- A. Newton First Law of Motion
- B. Newton Second Law
- C. Newton Third Law
- D. Law of Conservation of Momentum
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According to the textbook, what is momentum?
- A. The product of force and acceleration
- B. The product of mass and velocity
- C. The product of mass and acceleration
- D. The ratio of net force to mass
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According to Newton Second Law, how is the acceleration of an object related to its mass?
- A. It is directly proportional to its mass
- B. It is inversely proportional to its mass
- C. It is equal to its mass
- D. It is unrelated to its mass
Section B — Short Questions
- State Newton Third Law as given in the textbook.
- Under what system condition is momentum conserved, and how is momentum calculated?
Section C — Creative / Conceptual
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Two objects interact with each other inside a closed system, exerting forces on one another as they move.
Analyze the physical properties and laws governing the interaction of these two objects based on the provided text.
- Describe what happens to the total momentum of this closed system during the interaction.
- According to Newton Third Law, how does the reaction force compare to the action force when the two objects collide?
- If the net external force on an object in motion is zero, what will happen to its velocity according to Newton First Law of Motion?