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# Define Acceleration.

Last updated date: 20th Jul 2024
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Hint: Acceleration is the angry, fire-breathing dragon of motion variables when compared to displacement and velocity. It can be violent; some people are afraid of it; and if it's large, it makes you pay attention. That sensation you get when you're sitting in a plane during takeoff, slamming on the brakes in a car, or turning a fast corner in a go-kart are all examples of situations where you are accelerating.

Complete step-by-step solution:
Any process in which the velocity changes is referred to as acceleration. Because velocity is both a speed and a direction, there are only two ways to accelerate: change your speed or your direction—or both.
If you're not changing your speed or direction, you're not accelerating—no matter how fast you're going. So, a jet moving at 800 miles per hour in a straight line has zero acceleration, even though it is moving very fast because the velocity is constant. When the jet lands and comes to a quick stop, it will have acceleration since it’s slowing down.
The orientation of an object's acceleration is determined by the orientation of its net force. According to Newton's Second Law, the magnitude of an object's acceleration is the combined effect of two causes:
The net balance of all external forces acting on that object — magnitude is directly proportional to this net resulting force.
The magnitude of an object's mass is inversely proportional to its mass, depending on the materials from which it is made.
In mechanics, acceleration is defined as the rate of change of an object's velocity concerning time. Accelerations are measured as vector quantities (in that they have magnitude and direction).
The formula for acceleration is given as: $a=\dfrac{dv}{dt}$.
The unit SI unit of acceleration is $m/{{s}^{2}}$
Thus, Acceleration is defined as the rate of change of velocity.

Note: Negative acceleration denotes a decrease in velocity. This indicates that the displacement is negative. Retardation is another term for deceleration. In reality, negative acceleration is referred to as retardation. It is measured in $m/{{s}^{2}}$.