kinetic friction force

例句：

1. 1. The car's engineis producing a lot of heat, whichcauses the kinetic friction between the piston and the cylinder to increase.
   汽车发动机产生的热量导致活塞和气缸之间的动摩擦力增加。
2. 2. In order to improve the efficiencyof the machine, it is necessary toreduce the kinetic friction between the movingparts.
   为了提高机器的效率，有必要减少移动部件之间的动摩擦力。
3. 3. The friction between thetwo surfaces is due to thekinetic energy of the particles on the surface.
   两个表面之间的摩擦是由于表面粒子的动能引起的。