Thursday, June 21, 2012

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Motion

Motion
If a body changes its position with respect to its surrounding it is said to be in motion


Rest 
If a body does not changes its position with respect to its surrounding it is said to be in rest .


Reference Point
The point about which we study the motion of an object is called reference point.


Uniform Motion
If a body travels equal distance in equal interval of time, the body is said to be in uniform motion













Non-Uniform Motion
If a doesnot body travels equal distance in equal interval of time, the body is said to be in non- uniform motion.









Speed
The rate of change of distance per unit time is called speed. 
Speed=Distance travelled
              Time taken 
           = m     
               s    
           = m/s
Therefore, SI Unit of speed is m/s



Velocity
The rate of change of displacement per unit time is called speed. 
Velocity=Dislacement
                 Time taken 
              = m     
                  s    
              = m/s
Therefore, SI Unit of velocity is m/s




Distance Travelled
The length of a path travelled by a moving body in any direction is said to be in distance travelled.Its is a scalar quantity and it has magnitude (having unit) but no direction.It is measured in meter(m) in SI Units.


Displacement
The shortest distance between two points is called displacement.It iis a vector quantity.In SI System Unit of displacement is meter(m).The shortest is always the straight line.  

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