# Acceleration and average acceleration

In this article we will take a brief look at what are the concepts of **acceleration and average acceleration** in physics.

When the velocity of a body changes in form, direction or both it is said that the body possesses an acceleration.

The acceleration of a body defines how quickly the velocity changes over time.

We see then how i defines the acceleration:

medium = Δv(TI,TF)/Δt = v(TF)-v(TI)/TF-ti

It is therefore necessary to specify that v(TI) and v(TF) represent the instant speed you instantly and tf is called **average acceleration** in the time interval Δt.

In the event that the acceleration is directed in the direction of motion, It will be defined **accelerated**, While in the case that the velocity undergoes a reduction we are faced with an **Moto delayed**.

The formula above can then be written as:

medium = Δv/Δt = vf-vi/tf-ti

From the formula above we can deduce that, If we represent the speed in m/s and the time in seconds the unit of measurement of the acceleration will be the MPS^{2}, the demonstration is quickly made:

am = v/t = m/s/s = (m/s).(1/s)= m/s^{2}

Below is a summary of laws of motion:

Uniform motion:

Acceleration: a = 0

Vmedia: Vf = Vi = Vm = Δx/Δt

Position: XF = xi VmΔt

Uniformly accelerated rectilinear motion:

Acceleration: am = vf-vi/Δt

Speed: VF = Vi amΔt

Position: XF = xi viΔt 1/2amΔt^{2}