The force that tends to slow an object in motion is called friction. Friction is a resistive force that opposes the relative motion of two surfaces in contact. It arises due to the interaction of microscopic irregularities and/or adhesion between the surfaces. Friction acts in the direction opposite to the motion of the object and causes it to lose its kinetic energy, resulting in a decrease in speed or a change in its direction. There are different types of friction, including static friction, kinetic friction, and rolling friction, each acting on objects in specific situations. Understanding and considering friction is important in various fields of science, engineering, and everyday life to accurately analyze and design systems involving moving objects.