So there is also a frictional force.
所以这个是摩擦力。
So I know what the frictional force is given by this result.
由此我得到，摩擦力的大小。
Frictional forces may also act when there is no relative motion.
在无相对运动的情况下，也可以有摩擦力的作用。
And that now must be the frictional force, because NP is still the frictional force.
这肯定是摩擦力，因为NP还是摩擦力。
It has enough energy to overcome the frictional resistance in valves and registers.
它有足够的能量克服阀门和记录器的摩擦阻力。
It has enough energy to overcome the frictional resistance in valves and registers.
它有足够的能量克服阀门和记录器的摩擦阻力。
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