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。
Pressure and the appropriate frictional force is determined.
压力和适当的摩擦力的测定。
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。
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。
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