for Physics




Kinematics Formulae

Note:   Any difference can be found from the value of a latter item by subtracting the value which preceded it:

Δ t = t final – t initial
(the elapsed time or difference between two times, Δt, is the latter or final time less the earlier or initial time.)

Δ d = d final – d initial

Δ v = v final – v initial

Δ a = a final – a initial

v average   ≡   Δd / Δt   true by physics definition!

a average   ≡   Δv / Δt   true by physics definition!

Note:   An average can always be determined by summing the items then dividing by the number of items.   This is easy if there are a small number of items.   But caution must be observed if there are an infinite number of items and only the extreme items are averaged:

v average   =   ( v final + v initial ) / 2

a average   =   ( a final + a initial ) / 2


go to i.e. Physics menu,
or to site menu

created 12 August 2001
last revised 14 May 2010
by D Trapp
made with Mac