The difference between kinetic and static friction starts with how each force acts on an object. Static friction is the force that stops an object from moving when a push or pull is applied. It exists between two surfaces that are in contact but not sliding against each other. This friction increases with the applied force until it reaches its limit. For example, when you try to push a heavy table and it doesn't move, static friction is working against your effort.

Kinetic friction comes into play once the object actually starts moving. It acts between surfaces that are sliding over each other and usually remains constant during motion. Unlike static friction, kinetic friction does not adjust based on applied force and is typically weaker. This is why it's harder to start moving a box across the floor than to keep it sliding once it’s in motion.

Understanding the difference between kinetic and static friction helps explain everyday situations, like why a car needs more power to start moving than to keep driving at a steady speed.