In view of the coronavirus pandemic, we are making LIVE CLASSES and VIDEO CLASSES completely FREE to prevent interruption in studies
Home > NCERT > NCERT Solutions for Class 9 > NCERT Solutions for Class 9 Physics Chapter 9 Free PDF Download
NCERT Solutions for Class 9

NCERT Solutions for Class 9 Physics Chapter 9 Free PDF Download

NCERT Solutions for Class 9 Physics Chapter 9 – Force and Laws of Motion

Physics is the most essential part of science whose aim is to explain the behavior of the universe. And, it is an important part of class 9 Science. In this NCERT Solutions for Class 9 Physics Chapter 9, we are discussing the various aspects of Force and Law of Motion. Apart from this, we have explained each and every topic in a detailed easy language for easier understanding.

Our team of professionals who specializes in teaching has prepared these NCERT Solutions for Class 9 Physics Chapter 9. Also, the solution will give you complete freedom to learn the topic at any time and from anywhere. Apart from that, they will help to improve your grade. Besides, our expert team is always there to solve any problem or query. So, Hurry up and download the Toppr Android or iOS app or Signup for free.

Toppr app provides free video lectures, study materials, and 10 years of question papers for free. Download Toppr app for Android and iOS or signup for free.

Download NCERT Solutions for  Class 9 Science here

Download NCERT Solutions for Class 9 here

Download NCERT Solutions for all subjects here.

CBSE Class 9 Physics Chapter 9 – Force and Law of Motion NCERT Solutions

Generally, force refers to strength or energy. But, in Physics terms, force refers to the contact of an object that causes a movement change in its velocity. And, the law of motion refers to the three laws defined by Sir Isaac Newton.

Introduction- This topic tells what we have discussed in the previous chapter and what we are going to discuss in this chapter. Apart from that, it describes what is a force and how it works.

Subtopics covered under NCERT Solutions for Class 9 Physics Chapter 9

9.1 Balanced and Unbalanced force

This topic describes balanced and unbalanced forces.

  • Balanced Force- When we apply an equal force on an object that does not cause any movement in it is a balanced force.
  • Unbalanced Force- When an object move in a direction on applying unequal force from a different direction then it is an unbalanced force.

9.2 First Law of Motion

Galileo first proposed the first law of motion but Sir Isaac Newton corrected it. According to Newton, an object remains in the state of rest or uniform motion in a straight line until it is compelled with an external force.

In simple words, all objects resist a change in their state of motion.

9.3 Inertia and Mass

Inertia refers to the resistance that an object offers to remain in its current state of movement or rest. While on the other hand, mass refers to the weight of an object which decides its inertia.

9.4 Second Law of Motion

The second law of motion states that the change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.

9.4.1 Mathematical Formula of Second Law of Motion- This topic describes the mathematical formula of the second law of motion after defining different things related to it.

Change in momentum ∝ p2-p1
∝ mv – mu
∝ m × (v – u)
The rate of change of momentum = \(\frac{m×(v – u)}{t}\)
Or the applied force,
Force ∝ \(\frac{m×(v – u)}{t}\)
F = \(\frac{km×(v – u)}{t}\)
F = kma

9.5 Third Law of Motion

According to this law, every action has an opposite and equal reaction. Also, the action and reaction are equal in magnitude.

9.6 Conservation of momentum

This law tells that the momentum of two objects before and after collision remains the same. But the objects will move in the direction in which the heavier object was moving.

Along with every topic, there are several activities in the chapter for you to try.

You can download NCERT Solutions for Class 9 Physics Chapter 9 PDF by clicking on the download button below

ncert solutions for class 9 physics chapter 9

Download Toppr – Best Learning App for Class 5 to 12

Toppr provides you with so much advanced learning features that you won’t find anywhere else like:

  • Mock test- Chapter-wise test to judge your performance.
  • Live classes- Where teachers explain every topic to the students on a live network.
  • Adaptive Practices- Specially designed test according to your needs.
  • Online classes- The classes that teach you topic at your convenience.

Hurry and download the Toppr iOS, Android app or Signup for free now.

Share with friends

Customize your course in 30 seconds

Which class are you in?
5th
6th
7th
8th
9th
10th
11th
12th
Get ready for all-new Live Classes!
Now learn Live with India's best teachers. Join courses with the best schedule and enjoy fun and interactive classes.
tutor
tutor
Ashhar Firdausi
IIT Roorkee
Biology
tutor
tutor
Dr. Nazma Shaik
VTU
Chemistry
tutor
tutor
Gaurav Tiwari
APJAKTU
Physics
Get Started

Leave a Reply

avatar
  Subscribe  
Notify of

Get Question Papers of Last 10 Years

Which class are you in?
No thanks.