Chapter 8: Force and Laws of Motion Assertion-Reason Questions | science Class 9 CBSE

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Chapter 8: Force and Laws of Motion Assertion-Reason Questions | science Class 9 CBSE | ByteNotes.in

Assertion-Reason

Check the statement and reason

A-R

Question 1

Logic Check

Assertion (A): Force is a push or pull that can change the state of motion of an object. Reason (R): Force can change the speed, direction, or shape of an object.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 2

Logic Check

Assertion (A): Friction opposes the motion of an object. Reason (R): Friction always acts in the direction of motion.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 3

Logic Check

Assertion (A): A body continues in its state of rest or uniform motion unless acted upon by an unbalanced force. Reason (R): This is the statement of Newton's First Law of Motion.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 4

Logic Check

Assertion (A): A marble rolling on an ideal frictionless horizontal surface would continue to move forever. Reason (R): In absence of an unbalanced force, the object maintains uniform motion.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 5

Logic Check

Assertion (A): An object moving with a constant velocity has zero net external force acting on it. Reason (R): According to Newton's First Law, unbalanced force is required to change velocity, not to maintain it.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 6

Logic Check

Assertion (A): Heavier objects have greater inertia than lighter ones. Reason (R): Mass of an object is a measure of its inertia.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 7

Logic Check

Assertion (A): A coin placed on a card over a glass tumbler falls into the tumbler when the card is flicked away. Reason (R): The inertia of the coin resists the change in its state of rest.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 8

Logic Check

Assertion (A): Momentum of a body is given by the product of its mass and velocity. Reason (R): Momentum is a scalar quantity with SI unit kg·m/s.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 9

Logic Check

Assertion (A): A fast-moving cricket ball hurts more than a tennis ball of the same size. Reason (R): The cricket ball has greater momentum due to higher mass and velocity.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 10

Logic Check

Assertion (A): Force is directly proportional to the rate of change of momentum. Reason (R): Newton’s Second Law is mathematically expressed as F = ma.

Reasoning Options

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Chapter sections

Chapter 8: Force and Laws of Motion | Assertion-Reason

Assertion (A): Force is a push or pull that can change the state of motion of an object. Reason (R): Force can change the speed, direction, or shape of an object.

Assertion (A): Friction opposes the motion of an object. Reason (R): Friction always acts in the direction of motion.

Assertion (A): A body continues in its state of rest or uniform motion unless acted upon by an unbalanced force. Reason (R): This is the statement of Newton's First Law of Motion.

Assertion (A): A marble rolling on an ideal frictionless horizontal surface would continue to move forever. Reason (R): In absence of an unbalanced force, the object maintains uniform motion.

Assertion (A): An object moving with a constant velocity has zero net external force acting on it. Reason (R): According to Newton's First Law, unbalanced force is required to change velocity, not to maintain it.

Assertion (A): Heavier objects have greater inertia than lighter ones. Reason (R): Mass of an object is a measure of its inertia.

Assertion (A): A coin placed on a card over a glass tumbler falls into the tumbler when the card is flicked away. Reason (R): The inertia of the coin resists the change in its state of rest.

Assertion (A): Momentum of a body is given by the product of its mass and velocity. Reason (R): Momentum is a scalar quantity with SI unit kg·m/s.

Assertion (A): A fast-moving cricket ball hurts more than a tennis ball of the same size. Reason (R): The cricket ball has greater momentum due to higher mass and velocity.

Assertion (A): Force is directly proportional to the rate of change of momentum. Reason (R): Newton’s Second Law is mathematically expressed as F = ma.

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