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Lecture 2 Newton’s Laws and Frictional Force

Understanding Newton’s Laws and Frictional Force

Newton’s laws of motion form the foundation of classical mechanics, providing a framework for understanding the relationship between a body and the forces acting upon it. Among these forces, friction plays a crucial role in many everyday phenomena. Let’s delve into Newton’s laws of motion and explore how frictional forces interact with these principles.

Newton’s First Law: The Law of Inertia

Newton’s First Law states that an object at rest will stay at rest, and an object in motion will continue in motion at a constant velocity, unless acted upon by a net external force. This property of objects to resist changes in their state of motion is called inertia.

Frictional Force Interaction: When a book rests on a table, it remains stationary due to inertia. However, if you push the book, friction opposes the motion, eventually bringing it to a stop once the pushing force is removed.

Newton’s Second Law: The Law of Acceleration

Newton’s Second Law quantifies the relationship between the net force acting on an object and its acceleration. The law is formulated as.

Practical Applications of Friction

  1. Transportation: Friction between tires and roads provides the necessary grip for vehicles to move and stop safely.
  2. Walking and Running: Friction between our shoes and the ground allows us to walk and run without slipping.
  3. Industrial Machinery: Managing friction is crucial in machinery to minimize wear and tear and maintain efficiency.


Understanding friction through the lens of Newton’s laws of motion provides a comprehensive view of how forces interact to influence motion. Friction, while often seen as a hindrance, is essential for many daily activities and technological applications. By mastering these concepts, students and professionals alike can better appreciate and apply the principles of classical mechanics in various fields.

Course Overview CSIR NET Physical Science Correspondence Course proceeds from an explanation of theory to problem solving, helping you build a strong

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