Question

why Newton's 2nd law is known as real law of Newton?

Answer 1

We shall now state the newton's 1st law and 3rd law is contained in 2nd law . According to newton's second law

Answer 2

Newton's Second Law of Motion states that the acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the body.

There are other two laws of Newton :-

Newton's first law of motion states that an object at rest remains at rest and an object in motion remains in motion with the same velocity unless acted upon by what we call an unbalanced force. ... The force of gravity pulling down is balanced by the force of my kitchen table pushing up on my cup of coffee.

Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.