Motion In Physics Part 2

Hi Friends here we come again with the previous point that is related to Motion. In previous Post we have talk about Motion where we have dealt with some points so now lets continue from there...  

                     Some another most important terms about Motion...

The motion of objects is studied under two separate headings:

Kinematics: The study of the motion of the objects without taking into account the cause of their motion is called kinematics.

The word kinematics comes from the Greek word “kinema” meaning Motion.

Dynamics: The study of the motion of the objects by taking into account the cause of their change of state is called dynamics.

The word dynamics comes from the Greek word “dynamis” meaning Power.

Reference Frame:- A system of coordinate axes which defines the position of a particle or an event in two or three dimensional space is called a frame of reference.

The simplest frame of reference is, of course, the familiar Cartesian system of coordinates, in which the position of the particle is specified by its three coordinates x, y, z along the three perpendicular axes.

                                                     

 

                                                                                                         

A reference frame, with such four coordinates, x, y, z and t, is referred to as a space-time frame,-the four axes defining a four dimensional continuum, called space-time.

Motion in One, Two or Three Dimensions 

One Dimensional Motion: the motion of an object is called one dimensional, if only one of the three coordinates required to specify the position of the object in space changes w.r.t. time.

Ex: motion of a train along a straight railway track, A man walking on a level and narrow road.   

     

Two Dimensional Motion: The motion of an object is called Two dimensional, if two of the three coordinates required to specify the position of the object in space changes w.r.t. time.

Ex: A billiard ball moving over the billiard table, An insect crawling over the floor of a room.

Three Dimensional Motion: The motion of an object is called Three dimensional, if all the three coordinates required to specify the position of the object in space changes w.r.t. time.

Ex: A flying aeroplane, the random motion of gas.