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# 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 MPS2, the demonstration is quickly made:

`am = v/t = m/s/s = (m/s).(1/s)= m/s2`

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   1/2amΔt2`