# Some Formulas used in Science

These formulas are also available in the two Review Packets, along with a copy of the Periodic Table of Elements.

Acceleration     (a)    =   Change in velocity (m / s) / time taken for the change(s)  a    =    Vf - Vi  / tf - ti

Average Speed  (v)                            =   Distance / time                                             v    =    d / t

Density              (D)                            =    mass (g) / Volume (mL or cm3)                   D    =    m / V

Percent Efficiency (e)                       =  Work out (J) / Work in (j) x 100               %e    =   Wout / Win x 100

Force in Newtons (F)                         =   mass (kg) x acceleration (m / s2)                F     =   ma

Frequency in Hertz  (f)                     =   number of events (waves) / time (s)          f      =  # of events / t

Momentum (ρ)                                  =  mass (kg) x velocity (m / s)                           ρ    =  mv

Pressure (p)                                      =  Force (N) / area (m2)                                    p    =  F / A

Wavelength (λ)                                 =  velocity (m / s) / frequency (Hz)                  λ    =  v / f

Work (W)                                           = Force (N) x distance (m)                               W    =  Fd