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Newton’s Laws of Motion


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Newton's laws of motion are of fundamental importance in classical physics. Newton gave three laws connected with motion and are, popularly, known as Newton’s laws of motion.

(a) First Law (Law of Inertia)

Everybody continues in its state of rest or of uniform motion in a straight line unless it is compelled by some external force to change that state.







(b) Second Law

The rate of change of momentum of a body is directly proportional to the impressed force and takes place in the direction of the force.

     So, F= dp/dt

     This results force acting a body F is equal to the mass of the body m times acceleration of the body a.

     So, F = ma








(c)Third Law

To Every action there is an equal and opposite reaction.

FAB = - FBA 

The first two laws relate to the type of motion of a system that results from a given set of forces. The third law studies the basic nature of all forces i.e. they act in action - reaction pair.

"Newton's laws of Motion" is one of the easiest and important chapters of Mechanics in the Physics syllabus of IIT JEE, AIEEE and other engineering examinations. These laws are not new to any aspirant as he is using these laws even in previous classes. The examples based on this are very easy and can be seen even in day to day life.

The chapter is important not only because it fetches 2-3 questions in most of the engineering examination but also because it is prerequisite to the other chapters of Mechanics.

Following topics are covered under Newton’s Laws of motion:

Laws of motion is important from the perspective of scoring high in IIT JEE as there are few fixed pattern on which a number Multiple Choice Questions are framed on this topic. You are expected to do all the questions based on this to remain competitive in IIT JEE examination. It is very important to master these concepts at early stage as this forms the basis of your preparation for IIT JEE, AIEEE, DCE, EAMCET and other engineering entrance examinations.

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