The term "ニュートン" (Newton) refers to the unit of force in the International System of Units (SI). It is named after the famous physicist アイザック・ニュートン (Isaac Newton), who made significant contributions to classical mechanics. One newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. In practical terms, a force of one newton is roughly equivalent to the weight of a small apple. This unit is commonly used in physics and engineering to quantify forces, making it essential for understanding motion and the effects of forces on objects.