Question

State Newton’s first law of motion. Explain Inertia of a body.

Answer 1

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Newton's first law of motion states that “A body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it”.

Suppose a block is kept on the floor, it will remain at rest until we apply some external force to it. Also, we know that it takes us more effort or force to move a heavy mass. This is directly related to a property known as Inertia. This law is also known as the law of inertia.

Answer 2

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

Inertia is the resistance, of any physical object, to any change in its velocity. This includes changes to the object's speed, or direction of motion. ... Inertia is one of the primary manifestations of mass, which is a quantitative property of physical systems.