Question

what is the first law of motion.
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Answer 1

Answer:

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Answer 2

$\underline\huge{\bf\;Newton's\;fist\;law\;of\;motion}$

Newton built on galileo's idea and laid foundation of mechanics in terms of 3 laws of motion that go by his name .Galileo's law of inertia was his starting point which he formulated as the first law of motion

Concept of Inertia

Inertia is 'the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line'.

The mass of an object is a qualitative measure of inertia .More the mass,more will be the inertia of an object and vica-versa.

Inertia of an object can be of three types:

(1) Inertia of rest        (2)Inertia of motion          (3)Inertia of direction