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Rectangular co-ordinate system,, , , , , , , , , , , , , , , , , , , , The space we live in is three dimensional ie , we can specify the POSitio,, of any point in space with three numbers. To do so, choose a convenient point 0, as the origin and serves as reference point . Through O , we draw three muiua)),, perpendicular axes OX , OY and OZ are shown in the above figure . This is know,, as rectangular (cartesian) co-ordinate system . The three numbers — the distance, along OX axis , OY axis and OZ axis will specify the position of the body at a poin;, P in space . We say that co-ordinates of body are x,y and Zz. If all the three, co-ordinates x,y and z ofan object remain unchanged with time , we say the, object is at rest with respect to the co-ordinate system. If any one or more of the|, object co-ordinates change with time , we say that the object is moving with resped|, to the co-ordinate system. |, One Dimensional Motion, , . . . . |, In one dimensional motion, only one of the three rectangular co-ordinates|, changes with time. To locate the p, , $ sition of a body only one axis is required. It may}, be X-axis or Y-axis or Z-axis., , Two dimensional motion, In two dimensional motion, to locate the, three rectangular co-ordinates chang, , two axes are required, They may be, and Z-axes,, , Motion in three dimensions, , In three dimensional motion, with time . To locate the position of a, , ocate Position of a body , two of the, e with time. To locate the position of a body, may be X and Y-axes orXand Zaxes or Y, , , , gl the three rectangular co-ordinates chang°|, ody, all the axes X, Y and z are required