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1. Rectilinear or translatory motion

2. Circular or rotational motion

3. Oscillatory or vibratory motion

In addition to these, motion can be curvilinear also. Here, we are going to discuss rectilinear motion (one-dimensional) and curvilinear motion in two dimensions only.

MOTION IN ONE DIMENSION

(Rectilinear Motion)

When a particle is moving along a straight line, then its motion is said to be a rectilinear or straight line or 1-D motion.

When a particle is moving along a straight line, then its motion is said to be a rectilinear or straight line or 1-D motion.

PARAMETRES OF RECTILINEAR MOTION

Time In his classic work ‘Principie’ (1686) Newton wrote “I do not define time, space, place and motion, since they are well known to all,” and this is quite true that we all know what time is, but it is also a known fact that it is impossible to attach a well defined meaning to time. In the words of a famous Dutch physicists “In the world of human thought generally, and physical sciences particularly, the most important and most fruitful concepts are those to which it is impossible to attach a well-dened meaning”.

Time is a scalar quantity and it can never decrease. At one time, a physical object can be present at one location only. According to Newton, time is absolute i.e., it is the same for all frames of reference.

For example, if a coin is dropped from the ceiling of a moving elevator (wrt ground), then the time taken by the coin to reach from ceiling to oor of elevator is the same wrt lift frame of reference as well as wrt ground frame of reference i.e., if it  is the time of ight in left frame and t 2 is wrt ground, then according to “Newton” t 1 = t 2 .

The words of Dutch Physicists seem to be correct wrt time, because according to Einstein t 1 ≠ t 2.

Einstein explained this in his Theory of Relativity

Position or Location