Sliding friction refers to the force that opposes the motion of an object as it slides over a surface. Synonyms for sliding friction include kinetic friction, dynamic friction, and moving friction. This type of friction is dependent on the weight of the object, the roughness of the surfaces in contact, and the speed at which the object slides. Other synonyms for sliding friction include surface friction, shearing resistance, and drag force. This force is important to consider in many real-world applications, such as determining the frictional force on a car's tires or the braking distance of a train. Knowing the synonyms for sliding friction can help enhance one's knowledge of physics and engineering.