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2.  An object is in motion if its place changes
with respect to a fixed point which we call the
reference point.

3.  The distance of an object to a reference point
in a stated direction gives the position of the
object. Position is a vector quantity which has
both direction and magnitude.

4.  The change in position of an object is called
displacement.

5.  Distance traveled in unit time is called speed.

6.  Average speed is calculated by dividing the
total distance traveled by the total time taken.

7.  When we talk about speed and direction, we
use the term velocity.

8.  If an object moves with constant speed its
motion is called uniform motion.

9.  Speeding Up:
 If an object covers more distance than
pervious second its motion is called speeding
up.
 Slowing Down:
 If an object covers less distance than pervious
second its motion is called slowing down.