The athlete runs for 2 minutes 20 s = 140 s In 1 s, the given athlete covers a distance = In 40 s, the given athlete covers a distance of 200π m. The important topics covered in the chapter, Motion are as follows: The last section talks about the uniform circular motion of the object. Further, the equations of motion are derived in the fifth section with a graphical method and the following relations between the quantities are explained:Īll the concepts of the chapter are explained with the help of numerical. The above graphs are plotted for objects in uniform motion as well as non- uniform motion. The following three types of graphs are discussed: The fourth section deals with the graphical representation of motion. In the third section of the chapter, the concept of acceleration is covered along with its formula. Its mathematical expression is also given here. Apart from this, the section covers an explanation of the term velocity with the help of examples. In the second section of the chapter, measurement of the rate of motion is explained wherein, the concept of speed and average speed is covered in addition to their mathematical formulas and S.I. The concept is explained with the help of suitable examples and diagrams. In addition to this, the section talks about uniform and non-uniform motion. In the first section, the motion is described using examples and motion along a straight line is explained along with the concept of distance and displacement. The chapter is covered under six sections. Science NCERT Grade 9, Chapter 8, Motion lays emphasis on the concept of motion of an object.
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