Match List I with List II and select the correct answer using the code given below: List I | List II A. Dust flying off a beaten carpet | 1. Third Law of Motion B. Recoil of a gun | 2. Frictional force C. Catching a ball by pulling hands back | 3. Second Law of Motion (Impulse) D. Bicycle slowing down without pedalling | 4. First Law of Motion (Inertia)

Correct Option The correct option is A-4, B-1, C-3, D-2 . Explanation The application of Newton's Laws of Motion and the concept of frictional force in everyday physical phenomena. These laws govern how objects behave when forces act upon them. Statement-wise Analysis - A. Dust flying off a beaten carpet (Matches 4 - First Law of Motion/Inertia): According to Newton's First Law of Motion (Law of Inertia), an object at rest tends to stay at rest unless acted upon by an external force. When a carpet is beaten, the carpet fiber moves suddenly, but the dust particles, due to their inertia of rest, remain in their original position and separate from the carpet. - B. Recoil of a gun (Matches 1 - Third Law of Motion): Newton's Third Law states that for every action, there is an equal and opposite reaction. When a gun is fired, the bullet is pushed forward with a specific force (action). Simultaneously, the gun is pushed backward with an equal force (reaction), causing the recoil. - C. Catching a ball by pulling hands back (Matches 3 - Second Law of Motion/Impulse): Newton's Second Law relates force to the rate of change of momentum ($F = \frac{\Delta p}{\Delta t}$). By pulling the hands back while catching a fast-moving ball, the cricketer increases the time interval ($\Delta t$) over which the momentum of the ball is reduced to zero. Since force is inversely proportional to time for a constant change in momentum, increasing the time reduces the impact force on the hands, preventing injury. - D. Bicycle slowing down without pedalling (Matches 2 - Frictional force): When pedalling stops, the driving force ceases. The bicycle eventually comes to a halt due to external opposing forces, primarily friction between the tires and the road (rolling friction) and air resistance. These forces act in the direction opposite to motion. Key Takeaway Newton's Laws Summary: First Law defines Inertia (resistance to change in state); Second Law defines Force as the rate of change of momentum (Impulse concept); Third Law defines Action-Reaction pairs.

Match List I with List II and select the correct answer using the code given below: List I | List II A. Dust… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Force and laws of motion

mcqmedium

Match List I with List II and select the correct answer using the code given below:

List I	List II
A. Dust flying off a beaten carpet	1. Third Law of Motion
B. Recoil of a gun	2. Frictional force
C. Catching a ball by pulling hands back	3. Second Law of Motion (Impulse)
D. Bicycle slowing down without pedalling	4. First Law of Motion (Inertia)

NCERT textbook question

From NCERT Science - class 9 · Page 4

Options

AA-4, B-3, C-1, D-2
BA-4, B-1, C-3, D-2
CA-1, B-2, C-4, D-3
DA-2, B-3, C-1, D-4

Did you get this right?

Solution

Correct Option

The correct option is

A-4, B-1, C-3, D-2

Explanation

The application of Newton's Laws of Motion and the concept of frictional force in everyday physical phenomena. These laws govern how objects behave when forces act upon them.

Statement-wise Analysis

A. Dust flying off a beaten carpet (Matches 4 - First Law of Motion/Inertia):
According to Newton's First Law of Motion (Law of Inertia), an object at rest tends to stay at rest unless acted upon by an external force. When a carpet is beaten, the carpet fiber moves suddenly, but the dust particles, due to their inertia of rest, remain in their original position and separate from the carpet.
B. Recoil of a gun (Matches 1 - Third Law of Motion):
Newton's Third Law states that for every action, there is an equal and opposite reaction. When a gun is fired, the bullet is pushed forward with a specific force (action). Simultaneously, the gun is pushed backward with an equal force (reaction), causing the recoil.
C. Catching a ball by pulling hands back (Matches 3 - Second Law of Motion/Impulse):
Newton's Second Law relates force to the rate of change of momentum ($F = \frac{\Delta p}{\Delta t}$). By pulling the hands back while catching a fast-moving ball, the cricketer increases the time interval ($\Delta t$) over which the momentum of the ball is reduced to zero. Since force is inversely proportional to time for a constant change in momentum, increasing the time reduces the impact force on the hands, preventing injury.
D. Bicycle slowing down without pedalling (Matches 2 - Frictional force):
When pedalling stops, the driving force ceases. The bicycle eventually comes to a halt due to external opposing forces, primarily friction between the tires and the road (rolling friction) and air resistance. These forces act in the direction opposite to motion.

Key Takeaway

Newton's Laws Summary: First Law defines Inertia (resistance to change in state); Second Law defines Force as the rate of change of momentum (Impulse concept); Third Law defines Action-Reaction pairs.

Your note

More from Chapter 2: Force and laws of motion

With reference to the property of inertia, which one of the following comparisons is correct?

easy

The phenomenon of gun recoil is a direct consequence of:

easy

A motor vehicle with a dead battery requires a continuous push to start rather than a sudden jerk. This is best explained by the fact that:

medium

With reference to the motion of a bicycle, consider the following statements: 1. When pedalling stops, the bicycle slows down solely due to the absence of the pedalling force. 2. To keep the bicycle moving at a uniform velocity, the applied force must balance the frictional force. 3. An object moves with a uniform velocity when the pushing force is greater than the frictional force. Which of the statements given above is/are correct?

hard

Consider the following everyday experiences: 1. Dust coming out of a carpet when beaten with a stick. 2. Leaves getting detached from a tree when shaken vigorously is unrelated to the property of inertia. 3. A coin falling into a tumbler when the card below it is flicked. Which of the above can be explained by the Law of Inertia?

medium

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