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名师指要机械能是动能、重力势能与弹性势能的总和,是标量。动能Ek=12mv2,决定动能的是物体的质量与速率。发生弹性形变的物体具有弹性势能,弹簧弹性势能Ep=12kx2,决定弹性势能的是弹簧的劲度系数与形变量。重力势能Ep=mgh,h为物体相对零势能面的高度。《考试大纲》中涉及机械能的考点有:功和功率、动能和动能定理、重力做功与重力势能、功能关系、机械能守恒定律及其应用、实验五:探究动能定理、实验六:验证机械能守恒定律。辽宁省高考从2009年开始使用课标卷,到2013年为止,涉及机械能
Means that mechanical energy is kinetic energy, the potential of gravity and elastic potential energy is the sum of scalar. Kinetic energy Ek = 12mv2, determine the kinetic energy is the mass and rate of the object. The elastic deformation of the object has the elastic potential energy, spring elastic potential Ep = 12kx2, determine the elastic potential energy of the spring is the stiffness coefficient and deformation. The gravitational potential Ep = mgh, h is the height of the object relative to the zero potential energy surface. Test syllabus involves mechanical energy test sites are: power and power, kinetic energy and kinetic energy theorem, gravitational work and gravity potential, functional relationship, the law of conservation of mechanical energy and its application, the fifth experiment: to explore the kinetic energy theorem, the sixth experiment: to verify the law of conservation of mechanical energy . Liaoning Province college entrance examination from 2009 began using the standard volume, until 2013, involving mechanical energy