Newton first law provides the measure of ???

Newton's first law, also known as the law of inertia, describes the measure of inertia in an object. Inertia is the property of an object to resist changes in its motion. According to Newton's first law, an object at rest will remain at rest, and an object in motion will continue to move in a straight line at a constant velocity, unless acted upon by an external force.

The measure of inertia in an object can be determined by its mass. Mass is a measure of the amount of matter in an object. The greater the mass of an object, the greater its inertia will be, and the more force will be required to change its state of motion.

To measure the inertia of an object, you would need to determine its mass using a suitable method, such as using a balance or scale to measure its weight. The weight of an object can be used as an indicator of its mass, as weight is proportional to mass in the presence of gravity. However, it is important to note that mass is an intrinsic property of an object, while weight can vary depending on the gravitational force acting on it.

Once you have determined the mass of an object, you can use it as a measure of its inertia. This allows you to predict how an object will respond to forces acting upon it, in accordance with Newton's first law.