Question

define 1st law of Newton

Answer 1

The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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Answer 2

Newton's first law state that a body will remain in its position of rest or in motion until we apply an external force.
mathematically:-) F=0
we know that F = ma
ma=0
m is not equal to 0
a=dv/dt=0
body will be at rest or in uniform motion.