Answer: Abrasion
Physical weathering is a process of break down of rocks into smaller particles or sediments, with the effect of physical agents such as wind and water. Abrasion is a type of physical weathering process. In this process, eroded sediments affect the surface of the exposed rocks with friction, and wears away the particles from the exposed rocks. Abrasion is only one type of physical weathering which breaks the rocks into smaller fragments.