加速度

加速度，在物理学中，是指物体速度随时间的变化率。物体的加速度是作用在物体上的所有力的合力，由牛顿第二定律描述。加速度的国际单位是米每秒平方（m/s²）。加速度是矢量（有大小和方向），按照平行四边形法则相加。作为矢量，计算出的合力等于物体的质量（一个标量）和加速度的乘积。

Acceleration, in physics, is the rate at which the velocity of an object changes over time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. The SI unit for acceleration is the Meter per second squared (m/s²). Accelerations are vector quantities (they have magnitude and direction) and add according to the parallelogram law. As a vector, the calculated net force is equal to the product of the object's mass (a scalar quantity) and the acceleration.