interaction forces

Interaction forces are the ways in which objects or particles influence each other at a distance or through contact. These forces include gravity, which pulls objects toward each other; electromagnetic forces, which cause magnetic and electric effects; and contact forces like friction and tension that occur when objects touch and push or pull on each other. These forces determine how objects move, stay connected, or change shape. Understanding interaction forces helps explain everything from why a ball falls to the ground to how molecules stick together in substances.