# NCERT Solutions for Class 11 Physics Chapter 5 - Law of Motion In this chapter, the students understand the laws of motion in detail. The chapter begins by explaining the Aristotelian principles of motion. Then we move on to the law of inertia as examined by Galileo Galilei in the seventeenth century. The chapter then talks about Newton's law of motion in detail. The chapter then provides an explanation of the conservation of momentum in relation to Newton's laws.

The chapter moves on to the next topic of the equilibrium of a particle in mechanics. The chapter goes on to talk about friction and the circular motion of objects. We finally conclude by solving various problems in mechanics as given in the chapter.

• According to the Aristotelian principle of motion – an external force is required to keep an object in motion.
• The chapter also tells us about the law of inertia as discovered by Galileo Galilei.
• Galileo also gave his laws of motion which have been explained in the chapter.
• Then we move on to the famous Isaac Newton's three laws of motion.
• The first law is related to external force and acceleration of an object.
• The second law relates to the momentum of an object and applied force.
• The third law portrays how every action has an equal and opposite reaction.
• These laws are encapsulated in what is called Newtonian mechanics.
• These laws also give rise to the conservation of momentum, as explained in the chapter.
• Equilibrium of a particle is the situation when the net external force on a particle is zero.
• Various examples and derivations explain these concepts in great detail.
• The chapter also tells us about friction and the various types of friction like – static friction, rolling friction, etc.
• We also learn about the acceleration of a body in a circular motion.
• The chapter concludes by providing a framework for solving the problems of the concepts explained in the chapter.

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