Equation for

Density

                         mass

        Density  =  ---------

                          volume

OR

                m

           ρ = ------

                V

Equation for

Relative Density

                          density of substance

Relative Density = --------------------------

                          density of water

Equation for

Average Speed

                       distance moved

average speed = ---------------------

                        time taken

OR

     s

       V = ----      ?

      t

Equation for

Average Acceleration

                               change in velocity

average acceleration = ----------------------

                                time taken

OR

     ΔV

a = ----

      t

In the equations of motion,

what do each of these letters:

s       

u       

v       

a       

t       

stand for?

s = displacement [m]    

u = initial velocity [m/s]

v = final velocity [m/s]  

a = acceleration [m/s²]  

t = time [s]                 

Equation of motion

which equals

v = _________

final velcity = initial velocity + (acceleration X time)

OR

v = u + at

Equation of motion

which equals

s = __________

(but does not include v)

                        1

displacement = (initial velocity X time) + (--- X acceleration X time²)

                        2

OR

s = ut + ¹/₂ at²

Equation of motion

which equals

s = __________

(but does not include a)

1                             

displacement = --- (initial velocity +final velocity) X time

2                         

OR

s = ¹/₂ (u+v) t

Equation for motion

which equals

v^{2 = ____________}

final velocity² = initial velocity² + 2(acceleration X displacement)

OR

v² = u² + 2as

Equation for

Resultant Force

or

Newton's Second Law of Motion

resultant force = mass X acceleration

OR

F = ma

Equation for

Weight

weight = mass X gravititational feild strength

OR

W = mg

Equation for

Momentum

Equation for

Impulse

or

Change in Momentum

Equation for

Moment of a force

about a point

Moment of a force  = force X perpendicular distance

about a point                         from the point    

Equation for

Spring Constant

Equation for

Pressure

                force

Pressure = -------

                area

OR

     F

P = ---

      A

Equation for

Pressure

In Liquids

Pressure = density X gravitational potential energy X depth

OR

P = ρgh

Equation for

Work

Equation for

Gravitational Potential Energy

Gravitational potential energy = mass X gravity X distance moved

OR

PE = mgh

Equation for

Kinetic Energy

1

Kinetic Energy = (----) mass X Velocity²

2

OR

KE = (¹/₂) mv²

Equation for

Efficiency

                useful work done

Efficiency = ---------------------

               energy input

OR

                 useful energy output

efficiency = --------------------------

                 energy input

OR EVEN

                 useful power output

efficiency = -------------------------

                 power input

Equation for

Power

            work done

Power = -------------

           time

OR

Useful power output = force X speed

Equation for

a machine's mechanical advantage

                                  output force

Mechanical advantage = ------------------

                                  input force

Equation for

a machine's velocity ratio

                      distance moved by input force

Velocity ratio = ---------------------------------------

                      distance moved by output force

How to find

Kelvin temp. from Centigrade/Celsius temp.

Kelvin Temp. = Centigrade/Celsius Temp. + 273

OR

Temp/K = Temp/C + 273

Equation for

Energy Transfered

Energy Transfered = mass X specific heat capacity X temp. change

OR

Energy transfered = mcΔT

ANOTHER EQUATION...

Energy Transfered = mass X specific latent heat

OR

Energy Transfered = mL

Equation for the

speed of a wave

speed = frequency X wavelength

OR

v = fλ

Equation for

Refractive Index

of a medium

                         speed of light in a vacuum

refractive index = ---------------------------------

                         speed of light in medium

OR

                         sin (angle incidence)

refractive index= ---------------------------

                        sin (angle refraction)

Equation for

Charge

Charge = current X time

OR

Q = It

Equation for

Potential Difference

or

Voltage

Potential Difference = current X resistance

OR

V = IR

Equation for

Electrical Power

Power = Potential Difference X Current

OR

P = IV

ANOTHER EQUATION

Power = Current² X Resistance

OR

P = I²R

Equations for finding

Total Resistance

when multiple resistors are in a circuit

Series:

Total Resistance = R₁ + R₂ + R₃ etc...

Parallel:

                1       1       1

Total Resistance = ---- + ---- + ----   etc...

                 R₁      R₂     R₃