Slowing down, maybe? Caused by friction, if that's what you're asking.
When an object slows down it is still accelerating.
Air resistance.
gravity
It slows the object down.
When an object slows down, its acceleration is negative (in a linear sense), or in a direction opposed to its motion (in a vector sense).
Retardation or negative acceleration or deceleration.
Gravity is the force that causes objects to fall, while air resistance or drag slows down a falling object as it moves through the air. The larger the surface area of the object, the greater the air resistance force, which opposes the force of gravity and slows the object down.
Slower than it was before.
Slows it.
When a car slows down
The type of friction that slows down a sliding object is kinetic friction. It occurs between two objects in contact when one (or both) of the objects is in motion. Kinetic friction opposes the direction of the object's motion, leading to a decrease in its speed.
Slows it down, and heats it up.