Motion and kinematics

Motion, Speed, Kinematics, Dynamics, Acceleration, Laws of motion, Scalars, Vectors, Representation of vectors, Vector addition Scalar triple products, Vector product, Force, Friction, Collision, Work, Power energy, Types of energy, Potential energy Rest and Motion : A body is said to be at called distance traversed by the body. It isa rst if it does not change its position with scalar quantity whose S I. unit is metre respect to its surroundings with time The directional distance between initial and final position of the body is called displacement its position with respect to its surroundings It is a vector quantity whose S.I. unit is metre. Speed : The rate of change of distance travelled by a body is called speed. It is scalar A body is said to be in motion if it changes with time KINEMATICS quantity whose unit is metre/sec The most common and easily observable change that occurs in nature is motion. The branch of physics which deals with the study ofAS is the distance traversed by the body in motion is called mechanics. Its two aspects are time AT Kinematics and Dynamics. Kinematics deals with the study of motion without considering the body at given instant is called instantaneous factors which are responsible for it, whereas dynamics deals with the study of motionInstantaneous speed - LimA taking into consideration the factors causing it Motion can be classified as: Average speed Total distance aS Total time AT Instantaneous Speed : The speed of a Speed. Thus Instantaneous speed Lim Velocity : The rate of change of displace- 1. Rectinear or translatory motion : A mo ment of the body is called the velocity. It is a Total time 2. particle rctates about a fixed axis. onal motion : A motion where a Average velocity Total displacement As where As is the displacement of body in t