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Newton's first law of motion is also called 

Newton's first law of motion is also called  Correct Answer law of inertia

Correct option-2

Concept:-

Sir Isaac Newton has given three laws to describe the motion of an object. These laws are known as Newton's laws of motion.

1) NEWTON'S FIRST LAW OF MOTION:-

  • A body that continues to its state of rest will remain in uniform speed in a straight line unless and until it is compelled by an external force to change its state of rest or of uniform motion.
  • Newton's first law recognizes that everybody has some inertia.
  • Inertia is an intrinsic property of the body by the virtue of which it resists a change in its state of rest or of uniform motion.


2) NEWTON'S SECOND LAW OF MOTION:-

  • The net force applied to a body is equal to the rate of change of momentum.
  • For the case of mass, force equals mass times acceleration.
  • i.e. F = ma

Where,

  •  F = force applied
  • m = mass and
  • a = acceleration.
  • Unlike Newton’s first law of motion, Newton's second law of motion pertains to the behavior of objects for which all existing forces are unbalanced.
  • Newton's second law of motion is more quantitative and is used extensively to calculate what happens in situations involving a force.


3) NEWTON'S THIRD LAW OF MOTION:-

  • It states that to every action there will be an equal and opposite reaction.
  • i.e. “when one object exerts a force on the other object, the first object experiences a force which is equal in magnitude in the opposite direction of the force which is exerted”.
     

Explanation:-

I.The concept of rate of change of momentum can explain through Newton's second law of motion. So it is an incorrect statement.

II.Newton's first law of motion introduces the concept of inertia. 

  • Inertia is an intrinsic property of the body by the virtue of which it resists a change in its state of rest or of uniform motion.
  • So, Statement-II is correct.
     

III.Law of conservation of energy is itself the law of physics that deals with the calculation of energy only.

  • So, Statement-III is also incorrect.


Hence, option-2 is correct.

FORCE:-
  • Force is an external cause that is capable of changing the state of rest or motion of a particular object.
  • Force is a vector quantity. So it has both magnitude and direction.
  • The direction along which a force is applied is known as the direction of the force and the point where force is applied is called the application point.
  • Generally, we measure the magnitude of Force by using a spring balance.
  • The SI unit of force is Newton (N).

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