It stats that
If a body is at rest will remain at rest forever and if a body is in
motion will remain in motion forever untill an unbalanced force
acted upon it.
First part of this law is self evident that if a body is at rest will remain at rest forever untill some unbalances forc is acted upon it , but the second part is not self evident that a body in motion will remain in motin forever untill an unbalanced forced is acted upon it . in every day experience if we roll a ball on the floor after covring some distance it stops without applying some visible external force , actually there is aforce which is called friction which come into play and stop the ball .
this law is also known as law of INERTIA .
Inertia is the property of all physical bodies by vertue of which they try to retain their state of rest or of motion.
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