What is the other name of Newton's first law of motion?

Correct option is A

The correct answer is option (a): Law of inertia
Explanation:
Newton's First Law of Motion is also known as the Law of Inertia. It states that: "An object will remain at rest, or in uniform motion in a straight line unless acted upon by an external force."
This law emphasizes the concept of inertia, which is the property of an object to resist changes in its state of motion or rest.

Explanation of Other Options:

• B. Law of movement:
  This is not a standard term in physics. It might refer broadly to laws describing motion but is not related to Newton's laws specifically.
  
• C. Law of momentum:
  This refers to Newton's Second Law of Motion, which relates force, mass, and acceleration, and is expressed mathematically as:
  F = ma. It also connects to the concept of momentum (p=mv) and explains how force causes a change in momentum over time.
  
• D. Law of displacement:
  This is not a recognized law in physics. Displacement is a vector quantity representing the shortest distance between two points and is unrelated to Newton's laws.
  

Summary of Newton's Laws of Motion:
First Law (Law of Inertia): An object remains at rest or in uniform motion unless acted upon by an external force.
Second Law: Force equals mass times acceleration (F=ma).
Third Law: For every action, there is an equal and opposite reaction.