Now,the other kinds of vector fields we have seen physically are force fields.
我们从物理的角度,研究的另一类向量场是力场。
2
We have the cross-product of the position vector to this point times the force.
我们用这个点的，位置向量，乘以这个力。
3
Hopefully most of you know that the electric field is a vector field that basically tells you what kind of force will be exerted on a charged particle that you put in it.