Vector quantity:A quantity that has both magnitude and direction.
译文;矢量:一个既有大小又有方向的量
Scalar quantity A quantity that has magnitude,but no direction.
译文:标量:一个只有大小没有方向的量
Vector An arrow drawn to scale used to represent a vector quantity.
译文:矢:一个标有刻度的箭头去代表矢量
Motion A change of position.
译文:运动:位置的改变
Speed The distance traveled per time.
译文:速率:单位时间内走过的路程
Velocity The rate of change position and the direct of the motion.
译文:速度:沿运动方向位移的变化率
Acceleration Time rate of velocity:Acceleration=change in velocity/time it takes for change.
译文:加速度:速度的变化率,加速度=速度的变化量/这段时间
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