* Friction: This is the most common force that resists motion. It acts between surfaces in contact, opposing the relative motion. There are several types of friction, like:
* Static Friction: This force prevents an object from starting to move. Think of a heavy box on a floor - it takes some effort to get it moving.
* Kinetic Friction: This force acts on an object that's already moving, slowing it down. Think of a sliding box on a floor.
* Air Resistance: This force acts on objects moving through the air. It's also known as drag and depends on the object's shape, speed, and the density of the air. Think of a parachute slowing a skydiver's descent.
* Gravity: While gravity pulls an object towards the Earth, it can also act to stop an object's motion if the object is moving upwards. Think of a ball thrown straight up.
* Normal Force: This force acts perpendicular to the surface an object is resting on. It prevents an object from falling through the surface. Think of a book sitting on a table.
Important Note: These forces don't "stop" an object in the sense of making it completely still. Instead, they slow the object down until it eventually comes to rest.
