The laws of motion are a set of three fundamental principles formulated by Sir Isaac Newton in the 17th century. They are the cornerstone of classical mechanics and form the basis for understanding the motion of objects and the forces acting upon them.

In phy class 11 ch 4 , the Laws of Motion are discussed in Chapter 4, which covers the following topics:

• The first law of motion: The law of inertia, which states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity unless acted upon by an external force.

• The second law of motion: The law of acceleration, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

• The third law of motion: The law of action and reaction, which states that for every action, there is an equal and opposite reaction.