frictional force [力] 摩擦力 ; 磨擦力
sliding frictional force 滑动摩擦力
Dynamic frictional force 动态摩擦力
negative frictional force 负摩擦阻力 ; 负摩擦力
kinetic frictional force 称为动摩擦力
passive frictional force 被动磨擦力
frictional force curve 摩擦力曲线
The frictional force remains constant, dependent on the friction, the kinetic friction coefficient, is always the same...
摩擦力不守恒，它取决于摩擦力，动能摩擦系数，一直是相同的。
Friction prevents it from doing so so there's going to be a frictional force in this direction.
摩擦力则阻碍下滑，因此存在，此方向的摩擦力。
So there is also a frictional force.
所以这个是摩擦力。
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