解答图中的物理题---**Question Stem:** 如图 6 所示, 水平地面上放一个重 800 N 的物体, 一个人利用滑轮组拉动 物体匀速运动时, 物体与地面间的摩擦力为 160 N, 不计滑轮重、绳重及绳与滑 轮间的摩擦, 下列选项正确的是 (As shown in Figure 6, an object weighing 800 N is placed on a horizontal ground. When a person uses a pulley system to pull the object to move at a uniform velocity, the friction force between the object and the ground is 160 N. Neglecting the weight of the pulleys, the weight of the rope, and the friction between the rope and the pulleys, which of the following options is correct?) **Given Information:** * Weight of the object: 800 N * Friction force between the object and the ground: 160 N * Motion: Uniform velocity * Neglected factors: Pulley weight, rope weight, friction between rope and pulley. **Options:** A. A 是动滑轮 (A is a movable pulley) B. 拉力 F 为 80 N (Pulling force F is 80 N) C. 物体移动 10 cm, 绳子自由端移动 30 cm (The object moves 10 cm, and the free end of the rope moves 30 cm) D. 增大拉力 F 时, 物体与地面之间的摩擦力也会增大 (When the pulling force F increases, the friction force between the object and the ground also increases) **Chart/Diagram Description:** * **Type:** Pulley system diagram. * **Title:** 图 6 (Figure 6) * **Main Elements:** * A rectangular object is placed on a horizontal surface (indicated by a serrated line underneath). A wall with serrations indicating fixation is on the left. * Pulley B is attached to the object. * Pulley A is attached to the wall. * A rope is connected to the wall on the right, goes around pulley A, then goes around pulley B, and is pulled to the right by a force F. An arrow indicates the direction of force F to the right. * Pulley A is a fixed pulley (attached to the wall). * Pulley B is a movable pulley (attached to the object). * The rope segments pulling the object (via pulley B) are horizontal. There are two rope segments pulling on the object through pulley B. * The diagram shows a horizontal pulling arrangement for an object on a horizontal surface, overcoming friction.