摘要：This article reveals the importance of the visual principle in physics education process and its implementation using mechanics demonstrations. Visual principle is a guiding principle of educational activities in selecting the contents and the methods of teaching. Physics is an experimental science. Students can successfully master the basics of Physics provided the source of knowledge is a physical experiment based on the visual didactical principle. To optimize the teaching process it is necessary to visualize phenomena, processes or objects. Visualization is significant for problem solving in research and teaching. Physics demonstrations inure to this aim very well. Physics demonstration experiments illustrating mechanical phenomena for grade XI are presented and analyzed. The most of mechanical phenomena are characterized by different kinds of forces and energy. The relationships between them are showed by demonstration experiments. Demonstration experiments for determining the coefficient of friction, the body weight change of accelerating falling and the potential energy minimum principle are discussed. The place of the demonstrations and the possibilities of applying them during physics teaching are analyzed. Reasoning sequences for giving a logical sense to these physics demonstrations are introduced. These sequences have been based on the system of specially thinking schemes and prepared as a guide determining the steady movement toward a correct result. The demonstration and its reasoning sequence enable the pupils to understand essence of new subject, to colligate, to make conclusions. Reasoning sequences, prepared for demonstration experiments are efficient in training pupils’ way of thinking.
