一、斜面上运动的物体受到的摩擦力可用额外功求通常,我们碰到的是物体沿水平面匀速运动的情况,当物体沿水平面运动时,物体受到四个力作用,竖直方向,重力和支持力平衡;水平方向拉力和摩擦力平衡,而现在是物体沿斜面匀速运动,拉力和摩擦力并不平衡.现举例如 First, the friction of the moving objects on the slope can be used for extra work. Usually, what we come across is the situation that the object moves at a constant speed along the horizontal plane. When the object moves along the horizontal plane, the object is subjected to four forces, vertical direction, gravity and Balance of support force; horizontal tension and friction force balance, and now it is an object moving at a constant speed along the slope, tension and friction are not balanced.