# Definition of Newton's second law

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**Newton's second law**Definition from Language, Idioms & Slang Dictionaries & Glossaries

WordNet 2.0

**Noun**

1. the rate of change of momentum is proportional to the imposed force and goes in the direction of the force

(synonym) second law of motion, Newton's second law of motion

(hypernym) Newton's law of motion, Newton's law, law of motion

**Newton's second law**Definition from Encyclopedia Dictionaries & Glossaries

Wikipedia English - The Free Encyclopedia

**Newton's laws of motion**are three physical laws that together laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to said forces. They have been expressed in several different ways over nearly three centuries, and can be summarized as follows:

**First law**: When viewed in an inertial reference frame, an object either is at rest or moves at a constant velocity, unless acted upon by an external force.**Second law**: The vector sum of the forces on an object is equal to the total mass of that object multiplied by the acceleration of the object. In more technical terms, the acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass. Thus,**F**=*ma'*, where**F**is the net force acting on the object,*m*is the mass of the object and**a**is the acceleration of the object. Force and acceleration are both vectors (as denoted by the bold type). This means that they have both a magnitude (size) and a direction relative to some reference frame.**Third law**: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

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