__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**

__D__

__istance 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

__.It is measured in__

**magnitude (having unit) but no direction****.**

__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****.The shortest is always the straight line.**

__(m)__
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