BMAT PHYSICS FORMULA SHEET · PDF fileBMAT PHYSICS FORMULA SHEET BY MEDIFY EQUATIONS OF MOTION...
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BMAT PHYSICS FORMULA SHEET BY MEDIFY medify.co.uk/bmat EQUATIONS OF MOTION AT CONSTANT ACCELERATION v = 2 v + u s = t 2 v + u v = average speed, m/s s = displacement, m v = final velocity, m/s u = initial velocity, m/s a = acceleration, m/s 2 t = time, s v = u + at v 2 = u 2 + 2as s = ut + at 2 1 2 DENSITY ρ = m v ρ = density, kg/m 3 m = mass, kg v = volume, m 3 PRESSURE P = F A P = pressure, Pa or Nm -2 F = normal force, N A = area, m 2 POWER P = = = W t E t Q t P = Power, W W = work done, J t = time, s E = energy transferred, J Q = thermal energy transferred, J WEIGHT W = weight, N m = mass, kg g = acceleration due to gravity, m/s 2 W = mg SPECIFIC HEAT CAPACITY Q = heat absorbed/released due to change of temperature, J m = mass, kg c = specific heat capacity, J/kgK θ = change in temperature, K Q = mcθ SPECIFIC LATENT HEAT OF VAPORISATION OR FUSION Q = heat absorbed/released due to change of temperature, J m = mass, kg L = specific latent heat of fusion or vaporisation, J/Kg Q = mL FORCE F = Force, N m = mass, kg a = acceleration, m/s 2 F = ma MOMENT OF A FORCE ABOUT A POINT τ = moment of a force, Nm F = Force, N d = perpendicular distance from pivot to the line of action of the force, m τ = Fd MOMENT OF A FORCE ABOUT A POINT W = work done, J F = Force, N d = displacement, m W = Fd GRAVITATIONAL POTENTIAL ENERGY P.E.= potential energy, J m = mass, kg g = accerleration due to gravity, m/s 2 h = height, m P.E. = mgh LIQUID PRESSURE P = pressure at depth h, Pa ρ = density, kg/m 3 g = acceleration due to gravity, m/s 2 P = hρg BOYLE’S LAW P 1 = pressure of gas at state 1 P 2 = pressure of gas at state 2 V 1 = volume of gas at state 1 V 2 = volume of gas at state 2 P 1 V 1 = P 2 V 2 KINETIC ENERGY K.E. = kinetic energy, J m = mass, kg v = velocity. m/s K.E. = mv 2 1 2 OBJECT IN EQUILIBRIUM Σ clockwise moments = Σ anti-clockwise moments about the same pivot Σ upward forces = Σ downward forces EFFICIENCY E = x 100% useful energy converted total input energy E = x 100% output power input power
Transcript of BMAT PHYSICS FORMULA SHEET · PDF fileBMAT PHYSICS FORMULA SHEET BY MEDIFY EQUATIONS OF MOTION...
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
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