一、基本关系1.物体不受力时的运动:运动状态保持不变.2.受平衡力时的运动:保持匀速直线运动或静止状态.3.受非平衡力时的运动:运动状态将发生改变.(1)合力与运动方向相同时,物体做加速运动.(2)合力与运动方向相反时,物体做减速运动.(3)合力与运动方向不在同一条直线上时,物体 First, the basic relationship 1. Objects when the movement is not: the state of exercise remain unchanged. 2. Movement by the balance of force: to maintain uniform linear motion or at rest. 3. By non-balance force of the movement: the state of motion will be (1) When the resultant force is the same as the direction of the movement, the object accelerates (2) When the resultant force is opposite to the direction of the movement, the object makes deceleration motion (3) When the resultant force and the movement direction are not on the same straight line, the object