IGSCE Physics: Formula

How much is 0 kelvin in Celsius?

-273 degrees

Specfic heat capacity

change in thermal energy/ mass* change in temprature

Work done

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

Density

density = m / V
density (kg/m³) = mass (kg) / volume (m³)

potential diffrence

work done by a unit of charge passing through a component

Speed

Speed = Distance travelled (m) / Time (s)

Velocity

v = d / t
velocity (m/s) = distance (m) / time (s)

Acceleration

a = (v - u) / t
acceleration (m/s²) = change in velocity (m/s) / time (s)

Force

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

Weight

W = mg
Weight (N) = mass (kg) x gravitational field strength (N/kg)

Moment

Moment (Nm) = force (N) x perpendicular distance from pivot (m)

Power(current)

P = IV
Power (watts) = Curremt (A) x Voltage (V)

Energy

Energy (J) = power (watts) x time (s)

Current(charge)

I =C / T
Current (A) = Charge (Coulombs, C) / time (s)

Charge

C = I x T
Charge (Couloms, C) = Current (A) x time (s)

Voltage

V = IR
Voltage (V) = Current (A) x resistance (ohm)

efficiency

efficiency (%) = useful energy (J) / total energy (J) x 100

GPE, Gravitational Potential Energy

GPE = mgh
Gravitational potential enrgy (J) = mass (kg) x gravitional field strength (N/kg) x height (m)

Kinetic energy

KE = 0.5mv²
Kinetic energy (J) = 0.5 x mass (kg) x velocity² (m/s)

Power(work done)

P = W / t
Power (watts) = Work done (J) / time (s)

Pressure

p = F / A
pressure (Pascals, Pa) = force (N) / area /m²)

Pressure(without force)

p = h x g x density
pressure (Pa) = height (m) x density (kg/m³) x gravitational field strength (N/kg)

Proportionality of Pressure and Temperature

For a fixed amount of gas at constant volume:

p1 / T1 = p2 / T2
pressure-1 (Pa) / Temperature-1 (degrees C) = pressure-2 (Pa) / Temperature-2 (degrees C)

Proportionality of Pressure and Volume / boyle law

For a fixed amount of gas at constant temperature:

p1 x V1 = p2 x V2
pressure-1 (Pa) x Volume-1 (kg/m³) = pressure-2 (Pa) x Voume-2 (kg/m³)

Electromotive force

is the work done by a power source in moving a nuit of charge around a complete circuit
E.M.F = work done/per unit charge

Momement -- clockwise and anit - clcokwise

sum of clockwise moments = sum of anti clockwise momements

Hooke`s Law

Force = spring constant(how stiff the spring is)* extension