BMAT PHYSICS FORMULA SHEET BY MEDIFY medify.co.uk/bmat

EQUATIONS OF MOTION AT CONSTANT ACCELERATION

v = 2v + u

s = t 2v + u

v = average speed, m/s s = displacement, mv = final velocity, m/s u = initial velocity, m/sa = acceleration, m/s2 t = time, s

v = u + at

v2 = u2 + 2ass = ut + at212

DENSITY

ρ =mv

ρ = density, kg/m3

m = mass, kgv = volume, m3

PRESSURE

P =FA

P = pressure, Pa or Nm-2

F = normal force, NA = area, m2

POWER

P = = =Wt

Et

Qt

P = Power, WW = work done, J

t = time, sE = energy transferred, J

Q = thermal energy transferred, J

WEIGHT

W = weight, Nm = mass, kg

g = acceleration due to gravity, m/s2

W = mg

SPECIFIC HEATCAPACITY

Q = heat absorbed/released due tochange of temperature, J

m = mass, kgc = specific heat capacity, J/kgK

θ = change in temperature, K

Q = mcθ

SPECIFIC LATENT HEAT OFVAPORISATION OR FUSION

Q = heat absorbed/released due tochange of temperature, J

m = mass, kgL = specific latent heat of fusion or

vaporisation, J/Kg

Q = mL

FORCE

F = Force, Nm = mass, kg

a = acceleration, m/s2

F = ma

MOMENT OF A FORCEABOUT A POINT

τ = moment of a force, NmF = Force, N

d = perpendicular distancefrom pivot to the

line of action of the force, m

τ = Fd

MOMENT OF A FORCEABOUT A POINT

W = work done, JF = Force, N

d = displacement, m

W = Fd

GRAVITATIONALPOTENTIAL

ENERGY

P.E.= potential energy, Jm = mass, kg

g = accerleration due to gravity, m/s2

h = height, m

P.E. = mgh

LIQUID PRESSURE

P = pressure at depth h, Paρ = density, kg/m3

g = acceleration due to gravity, m/s2

P = hρg

BOYLE’S LAW

P1 = pressure of gas at state 1P2 = pressure of gas at state 2V1 = volume of gas at state 1V2 = volume of gas at state 2

P1V1 = P2V2

KINETICENERGY

K.E. = kinetic energy, Jm = mass, kg

v = velocity. m/s

K.E. = mv212

OBJECT INEQUILIBRIUM

Σ clockwise moments=

Σ anti-clockwise momentsabout the same pivot

Σ upward forces=

Σ downward forces

EFFICIENCY

E = x 100%useful energy convertedtotal input energy

E = x 100%output powerinput power

BMAT PHYSICS FORMULA SHEET BY MEDIFY medify.co.uk/bmat

WAVE EQUATION

ƒ =1T

v = wave speed, m/sƒ = frequency, Hzλ = wavelength, m

T = period, s

v = ƒλ

REFRACTIVE INDEX

n = sin rsin i n =

cv sin c =

1n

^

n = refractive index i = angle in air/vacuumr = angle in mediumc = speed of light in vacuum, m/sv = speed of light in medium, m/sc = critical angle^

TRANSFORMER EQUATION

Np = number of turns in the primary coilNs = number of turns in the secondary coilVp = voltage across primary coil, VVs = voltage across secondary coil, VIp = current in primary coil, AIs = current in secondary coil, A

NpNs

VpVs

IsIp

= =

ELECTRICITY

ξ = Qtotal work done

Q = charge, C t = time, sV = potential difference across two points, V I = current, AR = resistance, Ω W = work done between two points, JP = power, W E = electrical energy, Jξ = emf, V

Q = It V = IR P = VIV = WQ

E = VIt = I2Rt = tV2

R

10-12

10-9

10-6

10-3

10-2

10-1

10+12

10+3

10+6

10+9

pico nano micro milli centi deci kilo mega giga tera