In the third part, pondering for the teaching's theory about black box in senior teaching physics, I propose educational value of black-box in the middle school physics teaching.
第三部分为黑箱在中学物理教学中应用的理论思考，通过对黑箱特点的分析，阐述黑箱在中学物理教学中的教育价值和应用的原则。
The momentum and the theorem of momentum is one of key in the physics teaching of senior middle school.
动量与动量定理是高中物理教学的重点之一。
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