Objects acceleration magnitude is proportional to the force on the object, inversely proportional to the mass of the object, and the acceleration direction is the same as the direction of the combined force. From the point of view of physics, Newton's second law of motion can also be expressed as "the change rate of Momentum of a body over time is proportional to the sum of the external forces on it." The first derivative of momentum with respect to time is tantamount to the sum of the external forces. Newton's second law showed that at a low macro speed, the proportional expression is: a∝F/m, F∝ma; The math expression can be written as F=kma, where k is the proportional number and is one constant number. However, since there was no rule on how much force to act as a unit, the proportional system number k was arbitrarily chosen, and if k=1, F=ma, which is known today as Newton's second law math expression.

Power：F＝M*A

Quality ：M=F/A

acceleration ：A=F/M