Main distinction – Acceleration vs. Deceleration

Acceleration and deceleration are two that the most basic concepts encountered in mechanics. The main difference between acceleration and also deceleration is that acceleration refers to a price of change of velocity while deceleration refers to a value of acceleration which is negative.

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What is Acceleration

In physics, when a body changes its position, we quantify the change in position in terms of a quantity dubbed displacement. Displacement is a vector quantity. Its dimension is the distance between the body’s starting position and also the final position. The direction the the displacement vector is in the direction pointing native the starting position come the last position. The price of readjust of displacement gives the object’s velocity. If the displacement is provided by 

, then the velocity 


Acceleration is the price of change of velocity. If acceleration is given by 

, then it is defined:


Note that since velocity is a vector quantity, acceleration might mean a change in one of two people the rate or direction of one object. Things travelling in a curved course at consistent speed is quiet accelerating!

In the mathematics sense, an acceleration can either increase or diminish an object’s speed. In daily usage, however, when we talk around accelerations, we are talking around things speeding up quite than slowly down. Sprinters, specifically those sprinting for quick distances, need to rise their speeds at a very short time. Because that instance, once Usain Bolt set the civilization record because that the men’s 100 m sprint, he reached an acceleration of around 9.5 m s-2 at the start.


In his record-breaking 100 m sprint, Usain Bolt sped up at around 9.5 m s-2.

What is Deceleration

Since acceleration is a vector, it might take either positive or an unfavorable values. “Deceleration” is a term given to a an unfavorable acceleration. This method that the speed is decreasing end time. According to Newton’s second law, if over there is an acceleration there is an unbalanced force involved. If the resultant pressure is exhilaration on an object in the direction of the object’s motion, the object would have a confident acceleration: i.e. Its speed would increase. If the resultant pressure is acting on an item in the direction against the object’s direction the motion, then the object would have actually a an adverse acceleration: i.e. Its rate would decrease and the object would certainly eventually come to a stop. If the result force proceeds to act, the thing would proceed to speed up in the direction opposite to the direction in which it was initially travelling.

Difference between Acceleration and also Deceleration


Acceleration is the price of change of velocity.

Deceleration is a an unfavorable acceleration.

Direction the Forces

Acceleration happens when there is a resultant force on one object, in any kind of direction.

Deceleration takes place when a resultant force acts on an object in the direction opposite to  the direction in which the is moving.

Non-technical Usage

In everyday terms, an acceleration refers to an increase in speed.

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In everyday terms, a deceleration refers to a palliation in speed.


Dvorsky, G. (2013, July 26). The Physics of Usain Bolt’s civilization Record 100-meter Dash. Recall December 1, 2015, indigenous io9 – we come indigenous the future.