Who was Isaac Newton?
Isaac Newton, in full Sir Isaac Newton he boren (December 25.1642}Born in the hamlet of Woolsthorpe.
Three important laws of motion?
newton's First Law of Motion (Law of Inertia)
Newton's Second Law of Motion (Law of Mass and Acceleration)
Newton's Third Law of Motion

newton's First Law of Motion (Law of Inertia
Galileo said that velocity is not necessarily zero if there is no force; it is acceleration which is zero if there is no force. This idea was restated by Newton's first law of motion, sometimes called the law of inertia.
Newton's Second Law of Motion (Law of Mass and Acceleration)
The equation F = ma states that the net force on a body is equal to the mass multiplied by the acceleration.
3. Newton's Third Law of Motion
Newton's third is not a law of motion but a law of forces.