# What is the difference between acceleration and deceleration?

In the same way that velocity is the rate of change in displacement, acceleration is the rate of change in velocity. In other words, when a car increases its speed, it is said to be accelerating and when it slows down, it is said to be decelerating. Acceleration is a rate of change in velocity within a required time in a positive or negative direction, but what is deceleration? Whenever an object slows down during its movement, it slows down. So we can say that in acceleration and deceleration, velocity changes with respect to time, but what is the difference between acceleration and deceleration? Acceleration occurs when the speed of a moving object increases and deceleration is a negative acceleration.

So when you drive your car and press the speed paddle, you're accelerating the car, which means you're accelerating. Conversely, when you see a person coming in front, or when you see a red light in a cross section, you press the brake paddle and start the process of stopping the car. This is when you slow down the car. Thus, while acceleration causes things in motion to move faster, deceleration causes things in motion to slow down or come to a complete stop.

The frictional force is responsible for the car's deceleration and is in the x direction; therefore, the acceleration of a car is also in the x direction. The main difference between acceleration and deceleration is that acceleration refers to a rate of change in velocity, while deceleration refers to an acceleration value that is negative. When you increase the speed of your car, it accelerates until it reaches its maximum speed and then it runs at full speed, but it no longer accelerates. According to Newton's second law of motion, the force acting on a body of mass m is the product of its mass and its acceleration.

Your average acceleration is the ratio between a total change in velocity during a movement and the time required to complete that movement. As the vehicle accelerates forward, the deceleration is zero and the acceleration is in the direction of speed. For example, when Usain Bolt set the men's world speed record of 100 m, he achieved an acceleration of about 9.5 m s-2 at the start. Whether the acceleration of a body is positive or negative depends on the following two factors:.