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Chapters
2: Motion in One Dimension
▶ 3: Laws of Motion
4: Pressure in Fluids
5: Upthrust and Archimedes’ Principle
6: Heat and Energy
7: Energy Flow and Practices for Conservation of Resources
8: Light
9: Sound
10: Electricity and Magnetism – 1
11: Electricity and Magnetism – 2
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Solutions for Chapter 3: Laws of Motion
Below listed, you can find solutions for Chapter 3 of CISCE Goyal Brothers Prakashan for A New Approach to ICSE Physics Part 1 [English] Class 9.
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit I Practice Problems 1
Calculate the velocity of a body of mass 0.5 kg, when it has a linear momentum of 5 Ns.
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.
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.
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.
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit I Practice Problems 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
- Force developed by its engine
- Distance covered by the car.
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.
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit I Practice Problems 2
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.
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.
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit I Practice Problems 3
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
- Final velocity
- Distance covered.
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
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
- Final velocity
- time for which it accelerates.
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit I Exercise 1
Define force.
State four effects which a force can bring about. Give two examples in each case.
Explain giving two examples of following :
Contact forces
Explain giving two examples of following :
Non - contact forces
What do you understand by the term inertia?
What are inertia kinds?
Give two examples of inertia kinds.
What do you understand by the term momentum?
State two factors which determine the momentum of a body.
State unit of momentum in the CGS system.
State unit of momentum in the SI system.
Define Newton’s second law of motion.
Prove mathematically F = ma
Define absolute units of force in CGS as well as the SI system.
Derive the relation between newton and dyne.
State Newton’s third law of motion and give two examples.
Explain the following:
Why do we jerk wet clothes before spreading them on a line?
Explain the following:
Why does dust fly off, when a carpet is hit with a stick?
Explain the following:
Why do fruits fall off the branches in the strong wind?
Explain the following:
Why does a pillion rider fall forward, when the driver of a two-wheeler suddenly applies the brakes?
Explain the following:
Why does a boatman push the bank backward with a long bamboo pole, on launching his boat in the water?
Explain the following:
Why is it difficult to walk on marshy ground?
Explain the following:
Why is it dangerous to jump out of a moving vehicle? How can the danger be minimised?
Explain the following:
Why does a boatman push water backward with the oars, while rowing a boat?
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit II Exercise 2 (A) Objective Questions
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
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
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.
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)
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
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
Multiple Choice Question. Select the correct option.
Which of the following are vector quantities?
Momentum
Velocity
Force
All of these
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
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
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 3 Laws of Motion Unit II Exercise 2 (B) Subjective Questions
Write the answer of the question with reference to laws of gravitation.
State the universal law of gravitation.
How is acceleration due to gravity-related to
- mass of a planet
- distance of body from the center of the earth?
What do you understand by the term mass?
State two important characteristics of mass.
State unit of mass in CGS system.
State unit of mass in SI system.
Name the device used for measuring mass.
What do you understand by the term weight?
State two important characteristics of weight
State the unit of weight in CGS system.
State the unit of weight in SI system.
Name the device used for measuring weight
State four differences between mass and weight.
Does a body weigh the same at all places of the Earth? Give a reason for your answer.
Why is gold not weighed by a spring balance?
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.
A man weigh 800 N at the equator. How does the weight of man change at the following place?
At poles
A man weigh 800 N at the equator. How does the weight of man change at the following place?
100 km up in space
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
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.
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.
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.
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.
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.
Describe, briefly how can you calculate the value of ‘g’ with a simple pendulum.
Solutions for 3: Laws of Motion
Goyal Brothers Prakashan solutions for A New Approach to ICSE Physics Part 1 [English] Class 9 chapter 3 - Laws of Motion
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Concepts covered in A New Approach to ICSE Physics Part 1 [English] Class 9 chapter 3 Laws of Motion are Newton's First Law of Motion, Newton’s Second Law of Motion, Free Fall, Gravitational Units of Force, Newton’s Universal Law of Gravitation, Newton's Third Law of Motion, Newton’s Second Law of Motion in Terms of Rate of Change of Momentum, Force Due to Gravity, Acceleration Due to Gravity (Earth’s Gravitational Acceleration), Concept of Mass and Weight, Effect of Force, Types of Force: Contact Force, Types of Force: Non-Contact Force, Inertia and Mass, Types of Inertia, Linear Momentum, Change in Momentum, Rate of Change of Momentum.
Using Goyal Brothers Prakashan A New Approach to ICSE Physics Part 1 [English] Class 9 solutions Laws of Motion exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Goyal Brothers Prakashan Solutions are essential questions that can be asked in the final exam. Maximum CISCE A New Approach to ICSE Physics Part 1 [English] Class 9 students prefer Goyal Brothers Prakashan Textbook Solutions to score more in exams.
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