英语被动主动的概念The girl rode a bicycle with her hair waving in the

英语被动主动的概念
The girl rode a bicycle with her hair waving in the breeze.
her hair waving 头发飘起来,
我想说,头发本身不会动,是通过外界的因素才动,为什么不是被动呢?
her hair waving 为什么用主动呢，