The magnitude of the acceleration of the object is proportional to the force applied by the object, and inversely proportional to the mass of the object. The direction of the acceleration is the same as the direction of the external force. From a physics point of view, the second law of Newtonian motion can also be expressed as "the momentum change rate of an object changes with time is proportional to the sum of the external forces received", that is, the first derivative of momentum versus time is equal to the sum of external forces. Newton's second law states that at the macro low speed, the proportional expression: a∝F/m, F∝ma; can be written as \(F=kma\) with a mathematical expression, where k is the proportional coefficient, which is a constant. However, since there is no large force as the unit of force at that time, the selection of the proportional coefficient k has certain arbitrariness. If k=1, there is \(F=ma\), which is the Newton we know today. The mathematical expression of the second law.

Force: \(F=M \times A\)

Quality: \(M=F/A\)

Acceleration: \(A=F/M\)

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