Dynamics is the 3rd chapter in class 9 physics book and is included in FBISE and Punjab Board (BISE) Syllabus. Dynamics is very important chapter because it discussed the key terms and terminologies used frequently in physics.

Dynamics Notes discuses terms like Inertia, Momentum, Force, Force of Friction, Centripetal Force.

This PDF contains all the solution notes of class 9 math physics chapter 2 kinematics.

## Chapter 3 Topics Explained in Dynamics Notes

## Newton’s Laws of Motion

**Newton’s First Law (Law of Inertia):**

*Statement:*An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced external force.

**Newton’s Second Law:**

*Statement:*The acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the object’s mass. The direction of the acceleration is in the direction of the net force.*Mathematical Expression:***F=ma**, where**F**is the net force,**m**is the mass of the object, and*a*is the acceleration.

**Newton’s Third Law:**

*Statement:*For every action, there is an equal and opposite reaction. If object A exerts a force on object B, then object B simultaneously exerts a force of equal magnitude in the opposite direction on object A.

These laws, formulated by Sir Isaac Newton, are fundamental principles in classical mechanics and provide a basis for understanding the motion of objects.

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