This study showed that an increase in the coefficient of friction between the ball and the foot caused the ball to acquire more spin.
这项研究表明，脚和球之间的摩擦系数的增加导致了球获得更多的角动能。
For a ball rolling across the floor, that outside force could be the friction between the ball and the floor, or it could be the toddler that kicks the ball in another direction.
对于一个在地面上滚动的球而言，外力可能是球与地面之间的摩擦力或者幼童相反方向踢球产生的力。
Friction causes a rolling ball to stop finally.
摩擦力使滚动的球最终停了下来。
The built-in ball head allows you to adjust and set its friction so that it balances the weight of your camera without needing locking and unlocking between positions.
嵌入式球形云台可调节和设定阻尼，无需在不同位置间锁定和解锁，即可平衡相机重量。
The clamping of the friction disk is caused by the outwardly rolling of the steel ball along the slop rolling track under eccentric force.
离合器摩擦片的压紧是由钢球在离心力作用下沿斜面滚道向外滚动而引起的。
A lot of study showed that the friction of the ball friction coupling between piston and slipper obviously affected the life-span and the performance of the axial piston pump.
大量的研究表明，柱塞与滑靴之间的球铰副摩擦力很大程度上影响着轴向柱塞泵的性能及寿命。
The results show that one of the nano-Cu shows better tribological properties, the ultrasonic disperse process shows better friction-reducing properties than the ball-milling disperse process.
结果表明，其中一种纳米铜能够提高基础油的减摩性能，采用超声分散比采用球磨分散的减摩性能好。
X axis and Y axis adopt ball spiral rods with excellent precisions and low friction factors.
轴采用滚珠螺杆传动精度佳，摩擦系数小。
The four-ball machine test showed that the suspension possessed good extreme pressure performance and common antiwear performance; and had no effect on the friction coefficient by the MTM test.
四球试验结果表明，该悬浮液具有较好的极压性能，抗磨性能一般，MTM试验显示该悬浮液对摩擦系数影响不大。
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；
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；
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