Final answer:
Newton's 2nd law of motion is the formula for calculating force, defined as 'F = ma', where 'F' is force, 'm' is mass, and 'a' is acceleration.
Step-by-step explanation:
Newton's 2nd law of motion is the formula for force. Newton's second law of motion addresses the state when an object is moving with a changing velocity, indicating a change in either speed and/or direction. This law states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to the system's mass. Mathematically, this is often expressed as F = ma, where F stands for force, m for mass, and a for acceleration. This law helps in making predictions about how an object will move under the influence of given forces.