9.6简谐运动的能量阻尼振动（9.6 energy damping vibration of simple harmonic motion）.docVIP

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9.6简谐运动的能量阻尼振动（9.6 energy damping vibration of simple harmonic motion）.doc

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9.6简谐运动的能量阻尼振动（9.6 energy damping vibration of simple harmonic motion） 9.6 energy damping vibration of simple harmonic motion Learning guidance This section is the extension and expansion of the mechanical vibration. In the knowledge base of the conservation of mechanical energy, through the motion analysis of spring vibrator, pendulum, to summarize the law of conservation of mechanical energy in simple harmonic motion. Further from the perspective of kinematics and dynamics characteristics and laws of harmonic motion should pay special attention to. The principles and methods of the ideal model of learning, a profound understanding of the physics research methods for vibration damping, with examples to analyze and summarize the attention, not rote, it should be with the simple harmonic motion and vibration in comparison to grasp the physical nature. Key points of knowledge 1. energy of simple harmonic motion Vibration energy refers to the general mechanical vibration system can, at any time it is equal to the sum of the kinetic and potential energy. The vibration of the kinetic energy is determined by the vibration velocity, vibration energy is determined by the vibration displacement. In simple harmonic motion, because it does not consider the friction and resistance, so only gravity and spring work, so there is only the mutual transformation of kinetic energy and potential energy, kinetic energy and potential energy of the system remains unchanged, namely the conservation of mechanical energy. 2. the relation between amplitude and energy The vibration energy is bigger, in the distance, the kinetic energy is zero, the greater the potential energy, so the vibration object from equilibrium in the greater the distance, the amplitude is greater. So, for the same vibration system, the total energy is the sign of amplitude of vibration system, the larger the amplitude, the total energy system the greater the. In a simple harmonic motion, the amplitude of the vibration r