Question

state newton's 1st law of motion. why is it called as law of inertia ? on what factor does inertia depends ? does inertia play any role for an object moving on a friction less surface with uniform speed ?

Answer 1

First law states that in the absence of an unbalanced force an object remains in the same state of motion until an unbalanced force is applies.
The ability of an object to resist the state of its motion is known as inertia.Mass of an object is alternative way of measure of inertia greater the mass greater the inertia.