This concept includes: friction which primarily determines the reduction in the horizontal component of post-impact ball velocity;
擦力主要确认地面与网球表面接触时，地面对网球水平方向运行速度的影响性能；
Moreover, the use of additional resistance worn on the forearm while swinging a baseball bat did not contribute to further increases in instantaneous bat swing velocity and batted-ball velocity.
纵观这些有助于提高击球速度的因素，力量教练要用具备的科学研究信息去帮助棒球或垒球运动员增强其击球速度制定抗阻训练方案。
He used a body swerve to shake off a marker and create space for himself. Then, with marvelous disguise, with the merest of back lift from his left foot, he propelled the ball at startling velocity.
他突然变向摆脱掉防守他的球员，并为自己创造出空间，用一个逼真的假动作，仅仅向后提起左脚，就以惊人的速度将足球抽射出去。
And we have a string here and the string is attached to this ball and the whole thing is going around and so at one moment in time this has a velocity, like so.
这是绳子，绳子的一端连着小球，小球与转盘一起转动，一段时间后，小球得到这样一个速度。
It appears, however, that the "drag coefficient", CD, also depends on the velocity of the ball.
然而，阻力系数CD，也取决于球的速度。
The critical velocity of the Karo syrup would be 100 miles per hour for a quarter-inch ball bearing.
滚珠的临界速度，是每小时100英里，低得多。
What is the horizontal velocity of the golf ball when it takes off?
高尔夫球发射时，其水平速度是多少？
See the velocity and acceleration vectors change as the ball moves.
看看球移动时速率和加速度向量的变化。
Its sole purpose is to hold information about the current position, velocity and state of a ball.
它的唯一目的是保持对目前的位置，速度和球的状态信息。
The prediction of the position of hit point of ping-pong and the velocity of the ball when reaching the hit point in the ping-pong robot project has been a research focus.
针对乒乓球机器人项目中乒乓球击打点位置及球到达击打点速度的预测问题进行探讨，分别建立了乒乓球飞行阶段的状态方程模型和乒乓球反弹过程的运动模型。
Sketch the velocity of the ball as a function of time, from start to when it hits the ground.
绘出该球从开始运动至落地这段时间内随着时间变化的速度。
At the same weight ratio of ball-to-powder, enhancing the velocity of milling could accelerate the amorphization process.
在相同的球料比的条件下，提高球磨转速，可以大大促进非晶化的形成过程，缩短非晶形成的时间。
The reasons for error cut-in grinding of cage spherical outside surface of ball basket constant velocity joint is analyzed, and the solution for the problem is put forward.
分析了球笼式等速万向节保持架外球面切入磨削误差产生的原因，并提出解决和调整方法，从而进一步推导出调整计算式。
A small ball is making circular motion at the uniform velocity, the centripetal force has suddenly increased, it is proved that the small ball will generally make a spiral motion.
详细讨论了当向心力突然增大后，原来作匀速圆周运动的小球其运动轨迹的变化情况，证明了小球将作螺线运动。
The operation principle of contant velocity universal joint with double offset ball basket is introduced.
介绍双偏置式球笼等速万向节的工作原理。
Characteristic Analysis of Ball Basket Constant Velocity.
球笼等速万向节的特性分析。
A set of inspection equipment for steel ball of RF joint of automotive constant velocity universal joint drive shaft is introduced.
介绍汽车等速万向节传动轴的固定节（RF节）防止漏装钢珠的检测装置。
A set of inspection equipment for steel ball of RF joint of automotive constant velocity universal joint drive shaft is introduced.
介绍汽车等速万向节传动轴的固定节（RF节）防止漏装钢珠的检测装置。
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