* Acts against the direction of motion: Friction always opposes the motion of an object. If you push a box across the floor, friction acts in the opposite direction, making it harder to move.

* Gets larger as an object moves faster: For many types of friction, the force increases with the speed of the object. This is especially true for fluid friction (like air resistance). The faster you go, the harder the air pushes back against you.

Types of Friction

* Static friction: Keeps an object at rest until a force overcomes it.

* Kinetic friction: Acts on an object in motion.

* Fluid friction: Occurs when an object moves through a fluid (like air or water).

Let me know if you have any other questions about friction!