When you drive a car and press the gas pedal, the engine gives the wheels power to move forward. But when you take your foot off the gas pedal, the engine stops giving power to the wheels.
Even though you are not pressing the brakes, the car still slows down because of something called 'friction.' Friction is a force that tries to stop things from moving. For example, the tires rubbing against the road create friction that makes it harder for the car to keep moving.
Also, the air pushes against the car as it moves — this is called 'air resistance' or 'drag.' It's like when you stick your hand out of a car window and feel the wind pushing it back.
Another reason is that parts inside the car, like the engine and bearings, create a small amount of friction too. All these forces work together to slow the car down gradually.
So, even without pressing the brakes, the car slows down and eventually stops because friction and air resistance are pushing against it, using up its energy.