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:

  1. 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.

  2. 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.

  3. 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.

  4. 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

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