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NCERT Solutions for Class 9 Science Chapter 8

NCERT Solutions for Class 9 Science Chapter 8 - Motion

NCERT Solutions for Class 9 Science, provided by Vedantu, contain a detailed solution set for students. These NCERT Class 9 Chapter 8 Science Solutions also help you with a better understanding of the topic. You will get immense benefits from NCERT Solutions for Class 9 Science Chapter 8. With the option for free PDF downloads, you can access our comprehensive NCERT Solutions for Class 9 Science Chapter 8 PDF at any time. Download NCERT Solutions PDF to avail of a better and easier study curriculum with rewarding marks. You can also download NCERT Solutions for Class 9 Maths which will help you to revise the complete Syllabus and score more marks in your examinations.

NCERT Solutions for Class 9 Science Chapter 8 Motion part-1
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FAQ (Frequently Asked Questions)

Q1: Explain the distance-time graph and velocity-time graph.

A1: Distance-Time Graph

  • Distance-Time graphs show the change in position of an object with respect to time.

  • Linear variation = uniform motion & non-linear variations imply non- uniform motion.

  • The slope gives us speed.

Velocity-Time Graph

  • Velocity-Time graphs show the change in velocity with respect to time.

  • Slope gives acceleration.

  • The area under the curve gives the displacement.

  • Line parallel to the x-axis implies constant velocity. 

Q2: What are the topics and exercises covered in the NCERT Solutions for class 9 science chapter 8 by Vedantu?

A2: The following are the topics covered in the NCERT Solutions for class 9 science chapter 8 by Vedantu.

  • Ex 8.1 - Describing Motion

  • Ex 8.1.1 - Motion Along a Straight Line

  • Ex 8.1.2 - Uniform Motion and Nonuniform Motion

  • Ex 8.2 - Measuring the Rate of Motion

  • Ex 8.2.1 - Speed With Direction

  • Ex 8.3 - Rate of Change of Velocity

  • Ex 8.4 - Graphical Representation of Motion

  • Ex 8.4.1 - Distance–Time Graphs

  • Ex 8.4.2 - Velocity-Time Graphs

  • Ex 8.5 - Equations of Motion by Graphical Method

  • Ex 8.5.1 - Equation For Velocity-Time Relation

  • Ex 8.5.2 - Equation For Position-Time Relation

  • Ex 8.5.3 - Equation For Position–Velocity Relation

  • Ex 8.6 - Uniform Circular Motion.

The above chapters are tested through several exercises. The exercises for which solutions are available in NCERT Solutions for class 9 science chapter 8 are: 

  • Exercise 8.1 - 3 Questions with Solutions.

  • Exercise 8.2 - 5 Questions with Solutions.

  • Exercise 8.3 - 3 Questions with Solutions.

  • Exercise 8.4 - 4 Questions with Solutions.

  • Exercise 8.5 - 5 Questions with Solutions.

  • Exercise 8.6 - 10 Questions with Solutions.

Q3: What is the difference between speed and velocity?

A3: The major difference between speed and velocity are mentioned below:

  • Velocity - refers to the displacement of a given object over a time interval. The velocity has a specific direction. Velocity can hold a negative value as well. The formula for velocity is given by - Velocity = displacement/time.

  • Speed - Refers to the distance moved or travelled by an object over a time interval. Speed does not have any direction. Most importantly, speed cannot hold a negative value. The formula for speed is given by - Speed = distance/time.

Q4: Give a few examples of action and Newtons’ third law of motion.

A4: Newton’s third law states that every action has an equal and opposite reaction. Some example is as mentioned below:

  • Swimming - A swimmer while swimming pushes the water backwards by their hands. In return the water pushes the swimmer forwards, thus allowing him to go forward during swimming.

  • Walking - During walking, a person will push the ground in a backward direction. The ground in return pushes the person in the forward direction, thereby making him/her walk.

  • Flying - A bird in the process of flying pushes the air downwards with the aid of its wings. In return, the air pushes the bird upwards.

  • Sleeping - While a person is sleeping on a bed, his weight is opposed by a reaction force from the bed. This results in both the forces cancel each other out, and the person enjoys the equilibrium position.

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