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A body continuous its state of rest or of uniform motion in a straight line provide no external force acts on it .

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For example 	 A moving object does not stop moving by itself. A ball rolled on a rough surface stops earlier than that of rolled on a smooth ground. It is because rough surface offer greater friction.  	If there is no force to oppose the motion of body, the moving ball will never stop .

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First law of motion is also known as law of inertia. Inertia:  	Inertia of the body is its property due to which it resists any change in its state of rest or motion.

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When a net  Force  act on a body, it produce acceleration on the body in the direction of  applied force. The magnitude of acceleration is directly proportional to the net force acting on the body and inversely proportional to its mass .

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Its unit is Newton. One Newton: 	 One Newton is the force that produce an acceleration of 1m/ s 2   of mass 1 kg. 		1 Newton = ( 1 kg ) (1m/ s 2 )

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For every action  there is always equal but opposite reaction .

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Take an air filled balloon , when the balloon is set free, the air inside balloon rush out and balloon move forward. In this example the action is by the balloon that pushes the air out of it when set free. The reaction of the air which escapes out from the balloon acts on the balloon. It is due to this reaction of escaping air that move the balloon forward direction.

Newton laws of motion