Static Friction: Static friction refers to the resistance encountered when attempting to move an object at rest. It acts in the opposite direction of applied force until the force overcomes it, allowing the object to start moving.
Kinetic Friction: Kinetic friction refers to the resistance encountered when objects slide or move against each other. It acts in the opposite direction of motion and is usually smaller than static friction.
Coefficient of Friction: The coefficient of friction is a dimensionless number that represents how rough or smooth two surfaces are in contact with each other. It determines how much frictional force will be present between them.