一、摩擦力做功的特点1.摩擦力既可以做正功或负功,也可以不做功.2.在静摩擦力做功的过程中,只有机械能的相互转化(静摩擦力起着传递机械能的作用),而没有机械能转化为其他形式的能.在滑动摩擦力做功的过程中,既有机械能之间的相互转化,又有机械能与其他形式的能量之间的相互转 First, the characteristics of friction work 1. Friction can do positive or negative work, or do not work. 2. In the process of static friction work, only the mutual transformation of mechanical energy (static friction plays a role in the transmission of mechanical energy) No mechanical energy is converted into other forms of energy. In the process of sliding friction work, there is a mutual transformation between mechanical energy, and there is a mutual transfer between mechanical energy and other forms of energy.