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aioe 1) ee a, , Physical body., it is the bounded portion of matter, A body is composed of large number of, nuTibber, , , , , , , , , , , | particles., | Particle., , A particle is smallest portion of matter with no size. Math :, , | be denoted by a point. ; omemoaticatly it can, A body can be treated as particle when the size of the body is “, | compared to the distance traversed by the body or compared to the distance we, , I body from other bodies. “8 of the, A girl can be treated as particle, when she covers a distance of Ikm, while, , || going to school. But the same girl can not be treated as particle, while dancing, | The concepts of rigid body and particle are only ideal(imaginary).But they are, , || helpful in the study of mechanics., , l A body at rest, A body is said to be at rest if it does not changes its position with respect to time, , | ond its surroundings., , A body in motion, A body is said to be in motion if it changes its position with respect to time and its, , surroundings., , Types of motion, 1. One dimensional motion of a body., , 2. Two dimensional motion of a body., , 3. Three dimensional motion of a body., ]] One Dimensional Motion or Motion in a straight line or Rectilineo, | motion, , , , , , It is the motion of a body along a straight line., Ex: The motion of a stone dropped from a height, , Motion ina plane or Curvilineor motion, i ane or It is the motion of the body along @