Here's why:
* Acceleration is any change in velocity. Velocity has both speed and direction.
* Deceleration is a specific type of acceleration where the speed of an object decreases.
Examples of forces that cause deceleration:
* Friction: This opposes motion, slowing objects down (like a car braking).
* Air resistance: This force acts against objects moving through the air (like a parachute slowing a skydiver).
* Gravity: This pulls objects towards the Earth, causing them to slow down as they go upwards (like a ball thrown into the air).
* Applied force in the opposite direction of motion: If you push an object in the opposite direction it's moving, you'll slow it down.
Important Note: Deceleration is simply a change in speed in the negative direction. It's still an acceleration, just a change in velocity that results in a decrease in speed.
