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# Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 3 - Laws of Motion [Latest edition]

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## Chapter 3: Laws of Motion

Unit I Practice Problems 1Unit I Practice Problems 2Unit I Practice Problems 3Unit I Exercise 1Unit II Exercise 2 (A) Objective QuestionsUnit II Exercise 2 (B) Subjective Questions
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Unit I Practice Problems 1

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit I Practice Problems 1

Unit I Practice Problems 1 | Q 1

Calculate the velocity of a body of mass 0.5 kg, when it has a linear momentum of 5 Ns.

Unit I Practice Problems 1 | Q 2

An electron of mass 9 × 10−31 kg is moving with a linear velocity of 6 × 107 ms−1. Calculate the linear momentum of electron.

Unit I Practice Problems 1 | Q 3

A body of mass 200 g is moving with a velocity of 5 ms−1. If the velocity of the body changes to 17 ms−1, calculate the change in linear momentum of the body.

Unit I Practice Problems 1 | Q 4

A motorcycle of mass 100 kg is running at 10 ms−1. If its engine develops an extra linear momentum of 2000 Ns, calculate the new velocity of a motorcycle.

Unit I Practice Problems 1

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit I Practice Problems 1

Unit I Practice Problems 1 | Q 1

A car initially at rest, picks up a velocity of 72 kmh−1 in 20 seconds. If the mass of the car is 1000 kg, find

1. Force developed by its engine
2. Distance covered by the car.
Unit I Practice Problems 1 | Q 2

A golfer hits a ball at rest, such that the contact between the ball and golf stick is for 0.1 s. If the golf ball covers a linear distance of 400 m in 2 s, find the magnitude of force applied. Mass of golf ball is 50 g.

Unit I Practice Problems 2

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit I Practice Problems 2

Unit I Practice Problems 2 | Q 1

A car of mass 800 kg, moving at 54 kmh−1 is brought to rest over a distance of 15 m. Find the retarding force developed by the brakes of the car.

Unit I Practice Problems 2 | Q 2

A cricket player holds a cricket ball of mass 100 g by moving his hands backward by 0.75 m. If the initial velocity of the ball is 108 kmh−1, find the retarding force applied by the player.

Unit I Practice Problems 3

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit I Practice Problems 3

Unit I Practice Problems 3 | Q 1

A force of 600 dynes acts on a glass ball of mass 200 g for 12 s. If initially, the ball is at rest, find

1. Final velocity
2. Distance covered.
Unit I Practice Problems 3 | Q 2

A bullet of mass 30 g, and moving with a velocity x hits a wooden target with a force of 187.5 N. If the bullet penetrates 80 cm, find the value of x

Unit I Practice Problems 3 | Q 3

A car of mass 1000 kg develops a force of 500 N over a distance of 49 m. If initially, the car is at rest find

1. Final velocity
2. time for which it accelerates.
Unit I Exercise 1

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit I Exercise 1

Unit I Exercise 1 | Q 1.1

Define force.

Unit I Exercise 1 | Q 1.2

State four effects which a force can bring about. Give two examples in each case.

Unit I Exercise 1 | Q 2.1

Explain giving two examples of following :
Contact forces

Unit I Exercise 1 | Q 2.2

Explain giving two examples of following :
Non - contact forces

Unit I Exercise 1 | Q 3.1

What do you understand by the term inertia?

Unit I Exercise 1 | Q 3.2

What are inertia kinds?

Unit I Exercise 1 | Q 3.3

Give two examples of inertia kinds.

Unit I Exercise 1 | Q 4

What do you understand by the term momentum?

Unit I Exercise 1 | Q 5

State two factors which determine the momentum of a body.

Unit I Exercise 1 | Q 6.1

State unit of momentum in the CGS system.

Unit I Exercise 1 | Q 6.2

State unit of momentum in the SI system.

Unit I Exercise 1 | Q 7

Define Newton’s second law of motion.

Unit I Exercise 1 | Q 8

Prove mathematically F = ma

Unit I Exercise 1 | Q 9

Define absolute units of force in CGS as well as the SI system.

Unit I Exercise 1 | Q 10

Derive the relation between newton and dyne.

Unit I Exercise 1 | Q 11

State Newton’s third law of motion and give two examples.

Unit I Exercise 1 | Q 12.1

Explain the following:

Why do we jerk wet clothes before spreading them on a line?

Unit I Exercise 1 | Q 12.2

Explain the following:

Why does dust fly off, when a carpet is hit with a stick?

Unit I Exercise 1 | Q 12.3

Explain the following:

Why do fruits fall off the branches in the strong wind?

Unit I Exercise 1 | Q 12.4

Explain the following:

Why does a pillion rider fall forward, when the driver of a two-wheeler suddenly applies the brakes?

Unit I Exercise 1 | Q 12.5

Explain the following:

Why does a boatman push the bank backward with a long bamboo pole, on launching his boat in the water?

Unit I Exercise 1 | Q 12.6

Explain the following:

Why is it difficult to walk on marshy ground?

Unit I Exercise 1 | Q 12.7

Explain the following:

Why is it dangerous to jump out of a moving vehicle? How can the danger be minimised?

Unit I Exercise 1 | Q 12.8

Explain the following:

Why does a boatman push water backward with the oars, while rowing a boat?

Unit II Exercise 2 (A) Objective Questions

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit II Exercise 2 (A) Objective Questions

Unit II Exercise 2 (A) Objective Questions | Q 1

Multiple Choice Question. Select the correct option.

The mass of earth is 6 × 1024 kg and radius of earth is 6.4 × 106 m. The magnitude of force between the mass of 1 kg and the earth is:

• 9.770 N

• 9.810 N

• 830 N

• 9.790 N

Unit II Exercise 2 (A) Objective Questions | Q 2

Multiple Choice Question. Select the correct option.

A man is walking from east to west on a rough surface. The force on the man is directed:

• from west to east

• from east to west

• along the north

• along the west

Unit II Exercise 2 (A) Objective Questions | Q 3

Multiple Choice Question. Select the correct option.

Inertia is the property of a body by virtue of which the body is:

• unable to change by itself the state of rest

• unable to change by itself the state of uniform motion

• unable to change by itself the direction of motion

• unable to change by itself the state of rest or uniform motion.

Unit II Exercise 2 (A) Objective Questions | Q 4

Multiple Choice Question. Select the correct option.

The impulse of a body is equal to:

• (a) rate of change of its momentum

• (b) change in its momentum

• (c) the product of force applied on it and the time of application of force.

• (d) both (b) and (c)

Unit II Exercise 2 (A) Objective Questions | Q 5

Multiple Choice Question. Select the correct option.

A force acts on a body of mass 3 kg such that its velocity changes from 4 ms−1 to 10 ms−1. The change in momentum of the body is

• 42 kgms−1

• 2 kgms−1

• 18 kgms−1

• 14 kgms−1

Unit II Exercise 2 (A) Objective Questions | Q 6

Multiple Choice Question. Select the correct option.

Action-reaction forces

• act on the same body

• act on different bodies

• act along different lines

• act in same direction

Unit II Exercise 2 (A) Objective Questions | Q 7

Multiple Choice Question. Select the correct option.

Which of the following are vector quantities?

• Momentum

• Velocity

• Force

• All of these

Unit II Exercise 2 (A) Objective Questions | Q 8

Multiple Choice Question. Select the correct option.

A woman drawing water from a village well falls backward when the rope snaps. This is on account of

• Newton’s third law of motion

• Newton’s law of gravitation

• Newton’s second law of motion

• Newton’s first law of motion

Unit II Exercise 2 (A) Objective Questions | Q 9

Multiple Choice Question. Select the correct option.

When you kick a stone, you get hurt. Due to which property this happens?

• Inertia of stone

• Velocity of the kick

• Momentum of the kick

• Reaction of the stone

Unit II Exercise 2 (B) Subjective Questions

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 3 Laws of MotionUnit II Exercise 2 (B) Subjective Questions

Unit II Exercise 2 (B) Subjective Questions | Q 1

State Newton’s law of gravitation.

Unit II Exercise 2 (B) Subjective Questions | Q 2

How is acceleration due to gravity-related to

1. mass of a planet
2. distance of body from the center of the earth?
Unit II Exercise 2 (B) Subjective Questions | Q 3.1

What do you understand by the term mass?

Unit II Exercise 2 (B) Subjective Questions | Q 3.2

State two important characteristics of mass.

Unit II Exercise 2 (B) Subjective Questions | Q 3.3

State unit of mass in CGS system.

Unit II Exercise 2 (B) Subjective Questions | Q 3.3

State unit of mass in SI system.

Unit II Exercise 2 (B) Subjective Questions | Q 3.4

Name the device used for measuring mass.

Unit II Exercise 2 (B) Subjective Questions | Q 4.1

What do you understand by the term weight?

Unit II Exercise 2 (B) Subjective Questions | Q 4.2

State two important characteristics of weight

Unit II Exercise 2 (B) Subjective Questions | Q 4.3

State the unit of weight in CGS system.

Unit II Exercise 2 (B) Subjective Questions | Q 4.3

State the unit of weight in SI system.

Unit II Exercise 2 (B) Subjective Questions | Q 4.4

Name the device used for measuring weight

Unit II Exercise 2 (B) Subjective Questions | Q 5

State four differences between mass and weight.

Unit II Exercise 2 (B) Subjective Questions | Q 6

Does a body weigh the same at all places of the Earth? Give a reason for your answer.

Unit II Exercise 2 (B) Subjective Questions | Q 7

Why is gold not weighed by a spring balance?

Unit II Exercise 2 (B) Subjective Questions | Q 8

A man sits in a machine which generates acceleration five times more than the acceleration due to gravity. If the mass of the man is 80 kg, what is his weight? Take g = 10 ms−2.

Unit II Exercise 2 (B) Subjective Questions | Q 9.1

A man weigh 800 N at the equator. How does the weight of man change at the following place?

At poles

Unit II Exercise 2 (B) Subjective Questions | Q 9.2

A man weigh 800 N at the equator. How does the weight of man change at the following place?

100 km up in space

Unit II Exercise 2 (B) Subjective Questions | Q 9.3

A man weigh 800 N at the equator. How does the weight of man change at the following place?

10 km down in a mine

Unit II Exercise 2 (B) Subjective Questions | Q 10.1

How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?

Body is taken to Moscow.

Unit II Exercise 2 (B) Subjective Questions | Q 10.2

How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?

Body is taken to Ceylon.

Unit II Exercise 2 (B) Subjective Questions | Q 10.3

How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?

Body is taken to sea level.

Unit II Exercise 2 (B) Subjective Questions | Q 10.4

How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?

Body is taken to a high mountain.

Unit II Exercise 2 (B) Subjective Questions | Q 10.5

How is weight affected in the following case, when initially the body is weighed in Delhi with a spring balance?

Body is taken deep inside a mine.

Unit II Exercise 2 (B) Subjective Questions | Q 11

Describe, briefly how can you calculate the value of ‘g’ with a simple pendulum.

## Chapter 3: Laws of Motion

Unit I Practice Problems 1Unit I Practice Problems 2Unit I Practice Problems 3Unit I Exercise 1Unit II Exercise 2 (A) Objective QuestionsUnit II Exercise 2 (B) Subjective Questions ## Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 3 - Laws of Motion

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 3 (Laws of Motion) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Class 9 A New Approach to ICSE Physics Part 1 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Goyal Brothers Prakashan textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 A New Approach to ICSE Physics Part 1 chapter 3 Laws of Motion are cgs and SI Units of Force and Their Relation with Gravitational Units, General Properties of Non-contact Forces, Newton'S First Law of Motion, Definitions of Inertia and Force from First Law, Newton’s Second Law of Motion, Newton's Third Law of Motion, Universal Law of Gravitation, Free Fall, Weight as Force of Gravity, Gravitational Units of Force, Types of Force: Non-Contact Force, Concept of Weight.

Using Goyal Brothers Prakashan Class 9 solutions Laws of Motion exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Goyal Brothers Prakashan Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 9 prefer Goyal Brothers Prakashan Textbook Solutions to score more in exam.

Get the free view of chapter 3 Laws of Motion Class 9 extra questions for Class 9 A New Approach to ICSE Physics Part 1 and can use Shaalaa.com to keep it handy for your exam preparation

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