Friction
Friction is a force that opposes the relative motion or tendency of such motion of two surfaces in contact. It acts parallel to the surface of contact. Types of Friction: Static Friction: Definition: The frictional force that prevents two surfaces from sliding past each other. Example: A box resting on the floor does not move unless a certain amount of force is applied. Sliding (or Kinetic) Friction: Definition: The frictional force acting between two surfaces when one is sliding over the other. Example: A book sliding on a table experiences sliding friction. Rolling Friction: Definition: The frictional force when an object rolls over a surface. Example: A ball or a car tire rolling on the ground faces rolling friction. Fluid Friction (or Drag): Definition: The frictional force that resists the motion of an object through a fluid (liquid or gas). Example: Air resistance acting on a moving car or water resistance on a swimming