What is Newtons First Law of Motion in class 11 Physics chapter 4, and what key concept does it introduce?

<p><strong><span data-preserver-spaces="true">Newton's First Law of Motion</span></strong><span data-preserver-spaces="true"> is also known as the </span><strong><span data-preserver-spaces="true">Law of Inertia.</span></strong><span data-preserver-spaces="true"> It states that unless acted upon by an unbalanced force, the object in motion stays in motion in the same direction and </span><span data-preserver-spaces="true">with the same</span><span data-preserver-spaces="true"> speed and the object at rest stays at rest. The fundamental concept of inertia is introduced by the first law of Newton which refers to the resistance an object shows to changes in its state of motion. It is an inherent tendency of an object. Inertia is directly proportional to an object's mass which implies that a massive object has greater inertia and will require more force for velocity changes.</span></p><p><span data-preserver-spaces="true">Newton's First Law of Motion implies that </span><span data-preserver-spaces="true">to cause acceleration i.e. velocity changes, </span><span data-preserver-spaces="true"> a net force is needed and in the absence of the net force, </span><span data-preserver-spaces="true">the</span><span data-preserver-spaces="true"> objects maintain their current state of motion. This law challenges the earlier Aristotelian view which stated that to keep an object moving</span><span data-preserver-spaces="true">, a continuous force is required</span><span data-preserver-spaces="true">.</span></p>

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