Physics Formula for Class 9 Chapter-Motion

Home

Author at PW

October 16, 2025

Formula for Class 9 Chapter Motion

The chapter Motion in Class 9 Physics is one of the most important topics in the CBSE syllabus. It introduces students to the concept of how objects move, their speed, velocity, and acceleration. To understand this chapter properly, it is essential to learn and remember all the motion class 9 all formulas, as they form the base for many numerical and conceptual questions in exams.

The formulas of motion class 9 help students calculate distance, time, and speed, and also explain relationships between these quantities during uniform and non-uniform motion. Mastering each motion formula class 9 not only improves accuracy in solving problems but also makes you confident during exams.

Since many questions are directly based on these formulas and their applications, revising them regularly ensures better marks and a deeper understanding. Once you get a clear idea of the concepts and formulas, answering any question from this chapter becomes simple and quick.

Check Out: Class 9 Books

What is Motion?

Motion is when an object changes its place or position with time. In simple words, if something moves from one point to another, it is said to be in motion. Motion is always measured with respect to a fixed point, called a reference point.

An object may seem to be moving for one person but may look at rest for another person. Motion can happen in a straight line, a circle, or any path. By knowing the motion formula class 9 and the concepts of motion, students can solve questions easily and score better marks. There are different types of motion:

Uniform motion – when an object moves with constant speed.
Non-uniform motion – when the speed of the object keeps changing.

What is Distance and Displacement?

Distance is the total path covered by an object, while displacement is the shortest straight line between the starting and ending points. Knowing the difference between these helps in solving problems in motion and understanding vector and scalar quantities.

Distance is a scalar quantity, which means it only has magnitude.
Displacement is a vector quantity, which means it has both magnitude and direction.

What is Speed and Velocity?

Speed tells us how fast an object is moving, while velocity tells us how fast it is moving in a specific direction. Both are essential for solving motion problems in Class 9 Physics.

Speed = Distance ÷ Time; it is a scalar quantity.
Velocity = Displacement ÷ Time; it is a vector quantity.

What is Acceleration?

Acceleration is the rate at which an object’s velocity changes with time. It is important for understanding how objects speed up or slow down in motion.

Positive acceleration means the object is speeding up, while negative acceleration (deceleration) means it is slowing down.
Formula: Acceleration = Change in velocity ÷ Time

Check Out: Class 9 Question Banks

Motion Class 9 All Formulas

Go through the motion formula class 9 here:-

1. Speed

Speed = Distance ÷ Time

Unit: m/s, km/h

2. Velocity

Velocity = Displacement ÷ Time

It shows both magnitude and direction

3. Average Speed

Average Speed = Total Distance ÷ Total Time

4. Acceleration

Acceleration = Change in Velocity ÷ Time

Unit: m/s²

5. Equation of Motion (Uniformly Accelerated Motion)

v = u + at

(Final velocity = Initial velocity + Acceleration × Time)

s = ut + ½ at²

(Displacement = Initial velocity × Time + ½ × Acceleration × Time²)

v² = u² + 2as

(Final velocity squared = Initial velocity squared + 2 × Acceleration × Displacement)

6. Distance and Displacement

Distance: Total path travelled (scalar)

Displacement: Shortest path between initial and final position (vector)

Check Out: Class 9 Sample Papers

1. Understand the Basics of Motion

The first step is to clearly understand what motion is. Read the Class 9 Science Chapter 7 Motion carefully and visualise how objects move in real life. Knowing the concept makes it easier to remember the motion class 9 all formulas and use them correctly in problems.

2. Learn and Memorise All Formulas

Make a list of the motion formula class 9, like speed = distance ÷ time, velocity = displacement ÷ time, and the main equations of motion (v = u + at, s = ut + ½ at², v² = u² + 2as). Practising these regularly helps in solving questions quickly during exams.

3. Solve Numerical Problems

Use the formulas of motion class 9 to solve as many numerical problems as possible. Practising different types of questions will improve speed and help in understanding how to apply the motion chapter all formulas class 9 in real situations.

4. Use Diagrams and Graphs

Draw distance-time and velocity-time graphs to visualise motion. Diagrams make it easier to understand motion concepts and are often asked in exams. They also help in remembering all formulas of physics class 9 motion.

5. Revise Regularly with Sample Papers

Create a quick revision sheet with all formulas and important points. Solve CBSE sample papers for Class 9 motion to test your knowledge. Regular revision will make sure that all motion formula class 9 are fresh in your mind before exams.

Formula for Class 9 Chapter Motion FAQs

1. What is motion in Class 9 Physics?

Motion is when an object changes its position with respect to a reference point over time.

2. What is the difference between distance and displacement?

Distance is the total path travelled and is scalar, while displacement is the shortest path between start and end points and is a vector.

3. What is the difference between speed and velocity?

Speed is how fast an object moves and has no direction. Velocity shows speed in a specific direction.

4. What is acceleration?

Acceleration is the rate at which velocity changes with time. Positive acceleration increases speed, while negative acceleration (deceleration) reduces speed.

5. What are the main equations of motion in Class 9?

The main motion formulas class 9 are: