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Newton's First Law (Law of Inertia)

A body continues to be in its state of rest or of uniform motion along a straight line, unless it is acted upon by some external force to change the state.
  • If no net force acts on a body, then the velocity of the body cannot change, i.e., the body cannot accelerate.
  • Newton’s first law defines inertia and is rightly called the law of inertia.

Type of inertia

Inertia of rest It is the inability of a body to change by itself, its state of rest. This means a body at rest remains at rest and cannot start moving by its own.
 
Inertia of motion It is the inability of a body to change itself its state of uniform motion, i.e., a body in uniform motion can neither accelerate nor retard by its own.
 
Inertia of direction It is the inability of a body to change by itself the direction of motion.




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