【中文版】

剩余下滑力是指物体在滑行过程中所受到的阻力，是下滑力与摩擦力的差值。在物体下滑时，下滑力是物体重力沿斜面向下的分力，而摩擦力则是物体与接触面之间产生的阻力。因此，剩余下滑力等于重力沿斜面向下的分力减去摩擦力。

剩余下滑力的大小与物体的重量、斜面的倾斜角度、接触面的粗糙度等因素有关。在物体下滑时，如果斜面倾斜角度越大，剩余下滑力就越大；如果接触面越粗糙，剩余下滑力也就越大。

剩余下滑力是物理学中的一个概念，它在许多领域都有应用，例如在工程、机械、物理等学科中都有涉及。此外，剩余下滑力也是引起物体滑行时产生加速度和速度变化的原因之一，对于一些需要精确控制运动轨迹的领域，如航空航天领域，剩余下滑力的研究也是非常重要的。

【英文版】

The residual downward force refers to the resistance force acting on an object during its slide. It is the difference between the downward force and the friction force. When an object slides down, the downward force is the component of the weight of the object in the downward direction of the slope, while the friction force is the resistance force generated between the object and the contact surface. Therefore, the residual downward force equals to the downward component of the weight minus the friction force.

The size of the residual downward force is related to the weight of the object, the slope angle, and the roughness of the contact surface. When an object slides down, if the slope angle is larger, the residual downward force is larger; if the contact surface is more rough, the residual downward force is also larger.

The residual downward force is a concept in physics, which is applied in many fields, such as engineering, machinery, physics and so on. In addition, the residual downward force is also one of the reasons for objects to accelerate and change speed during slide. For some fields that require precise control of the trajectory of motion, such as aerospace, the study of residual downward force is also very important.