英语中的speed和velocity,哪个是速度哪个是速率?今天翻看英文的物理课本,发现一个问题,书里提到speed is a scalar quantity(标量),velocity is a vector quantity(矢量),但speed是速度,velocity是速率,这和高中物理书上所说的速度属于矢量,速率属于标量不是相反吗?望高人指点....
In the field of physics, velocity is a vector quantity, meaning it has both magnitude and direction. This distinction is important because it allows scientists to accurately describe the motion of objects in three-dimensional space. By specifying both the speed and the direction of an object's ...
它两都有速度的意思，但是英文同义词和中文同义词不大一样，英文的同义词指的是两个词都包含一大堆意思，其中有些意思是完全相同的，speed 除了速度名词还有动词的用法，velocity不可以，而且这个词也相当不常用，用起来和speed意思一样 参考资料：<a href="http://zhidao.baidu.com/question/55765903....
速率是路程/时间，就是移动路线的长度/时间，没有方向。速度是位移/时间，就是两点间的距离/时间，有方向。如果是曲线运动，两个值就不同了。比如40秒跑完400m跑道，速率是10m/s，速度是0
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。
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is a direction-awar
Speedisindependentofdirection.•Thespeedofanobjectcanbedescribedtwoways:•Instantaneousspeedis“thespeedataspecificinstant”.Initialspeedandfinalspeedareexamplesof instantaneousspeed.•Aspeedometermeasuresinstantaneousspeed.Velocityisavectorquantity,ithasadirection!Intheequation,“v”canrepresenteithervelocityorspeed...
Velocity is avector quantity. Both magnitude and direction are expected to characterize it. The scalar supreme value (size) of velocity is called speed. Being a reasonably inferred unit, whose amount is estimated in the SI (decimal standard) as meters every second (m/s). The SI base unit ...
Explain why velocity is a vector quantity. How to calculate velocity? Explain why motion in a circle involves constant speed but changing velocity. Distance and Displacement, Speed and Velocity Examples: 1. A girl walks 210m in two minutes. Calculate her average speed. ...
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...