在日常用语中，这两个词没有区别，可以通用。而在物理学里，velocity 是一个矢量(vector quantity)表示起点与终点间直线距离的长度除以所用时间所得的量，并注明方向：而 speed 是一个数量(scalar quantity)，是指起点到终点所走过的所有路程除以所用时间所得的量，且不标明方向。
The instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of x with respect to t: $$v(t)=\frac{d}{dt}x(t).$$ Like average velocity, instantaneous velocity is a vector with dimension of length per time. The in...
Velocity is a vector, because velocity is speed in a given direction. Example : A boy walks in a positive direction and then back again with a constant speed of 2 m/s, so he walks with a velocity of +2 m/s and then with a velocity of –2m/s. Image Distance–time graphs On a ...
Notice that this definition indicates that velocity is a vector because displacement is a vector. It has both magnitude and direction. The SI unit for velocity is meters per second or m/s, but many other units, such as km/h, mi/h (also written as mph), and cm/s, are in common use...
The velocity vector is given by: {eq}v(t) = \frac{{dp}}{{dt}} {/eq} Then, speed of {eq}p(t) {/eq} funtion is define as; {eq}\left\| {{\text{ }}v(a)} \right\| = \left\| {{{\left( {\frac{{dp}}{{dt}}} \right...
The Velocity from Direction And Speed (Random Direction) Block calculates a velocity for the particle based on a blend ratio between a random direction (per-particle), and the direction attribute.The Block then scales the final direction vector by a speed, and composes ...
Problem to be solved: to provide a suitable vector extraction technique by extracting motion. A vector extracting device 10 extracts a velocity vector from the moving picture.The vector extracting apparatus 10 acquires the velocity vector for each of the plurality of points based on the motion ...
Neural prostheses decode intention from cortical activity to restore upper extremity movement. Typical decoding algorithms extract velocity—a vector quantity with direction and magnitude (speed) —from neuronal firing rates. Standard decoding
speed指运动的速度,既可指快速,也可指慢速; velocity表示沿一定路线运动的速度,通常指直线、弧线或圆周运动的速度,这个词可与speed通用,但多用于科学技术方面。一、velocity词汇分析音标：英 [vəˈlɒsəti] 美 [vəˈlɑ:səti]释义：速率，速度;周转率...
The velocity of an object is the speed of the object in a specified direction. Thus, if a plane is flying due south at 500 km/h, its speed is 500 km/h, but its velocity is 500 km/h due south. It follows that if the plane had flown in a circular path for one hour at a ...