By the principles of the electric charge conservation, the mass conservation, the energy conservation and the momentum conservation in the nuclear reaction, threshold can be calculated with the methods of primary physics and can be applied to various collision types.

The CAI Courseware Design and Application Effect Evaluation Research in Junior Middle School Physics;

The article has classified scientific research in junior physics,points out the basic steps,common process and points for attention.

With the transformation of Chinese education system from examination-oriented one to all-round development, the teaching method in junior physics class focusing only on knowledge can t keep pace with society.

With the ongoing reform of curriculum in the basic education and the development of the new curriculum of junior physics, it has become an urgent problem that how to stimulate students interest and initiative to study and to improve their abilities of science inquiry thus reflect the notion of Physics Curriculum Standards.

Based on educational psychology theory and research findings related to effective teaching ,combined with my own sixteen years of teaching practice, I give a definition of effective teaching to middle school physics and I Propose standards for effective teaching to middle school physics.