速度是描述物体运动的重要物理量,并且联系着动量、动能等物理量。在许多绳、杆连接体中都会涉及速度的求解问题,若能正确应用速度投影定理,则会使问题的解决变得直观、简便。速度投影定理的内容是:同一瞬时,做平面运动的刚体上任意两点的速度在两点连线上的投影相等。两个物体以轻绳 Speed ​​is to describe the physical movement of an important physical quantity, and associated with momentum, kinetic energy and other physical quantities. In many rope and rod connections, the problem of solving velocity is involved. If the velocity projection theorem is correctly used, the problem solving can be intuitive and easy. Projection of the speed of the content is: the same instantaneous, doing plane motion of rigid body at any two points on the line at the same speed projection. Two objects with a light rope