EQUATIONS Flashcards
(you must learn all of these)
density (kg/m³)
mass (kg)/volume (m³) ρ = m/V
speed (m/s)
distance/time v = s/t
acceleration (m/s²)
change in velocity (m/s)/time(s) a = (v-u)/t
kinetic energy (J)
0.5 × mass (kg) × (speed (m/s))² KE = ½ mv²
force (N)
mass (kg) × acceleration (m/s²) F = ma
work done (J)
force (N) × distance (m) (along the line of action of the force) WD = F x D
power (W)
work done (J)/time(s) P = WD / t
momentum (kg m/s)
mass (kg) × velocity (m/s) p = mv
weight or gravity force (N)
mass (kg) × gravitational field strength, g (N/kg) F = W = mg
potential energy (J)
mass (kg) × height (m) × gravitational field strength, g (N/kg) GPE = mgh
pressure (Pa)
force (N) / area (m²)
moment of a force (Nm)
force (N) x distance (m) (normal to the direction of the force)
charge flow (C)
current (A) × time (s) Q = It
energy transferred (J)
(electricity)
charge (C) × potential difference (V) E = QV
potential difference (V)
current (A) × resistance (Ω) V = IR
power (W)
(ELECTRICITY)
potential difference (V) × current (A) = (current (A))² × resistance (Ω)
P = IV = I²R
energy transferred (J, kWh)
power (W, kW) × time (s, h) E = Pt
force on a conductor (at right angles to a magnetic field) carrying a current (N)
magnetic field strength (T) × current (A) × length (m) F = BIL
potential difference across primary coil (V) / potential difference across secondary coil (V)
number of turns in primary coil / number of turns in secondary coil V₁V₂ = N₁N₂
energy transferred in stretching (J)
0.5 × spring constant (N/m) × (extension (m))² E = ½ ke²
SUVAT EQUATIONS:
v = u + at
s = ut + ½at²
v² = u² + 2as
s = (v+u)/2 x t
s = vt - ½at²
pressure due to column of liquid (Pa)
height of column (m) x density of liquid (kg/m³) x g (N/kg)
thermal energy for a change in state (J)
mass (kg) × specific latent heat (J/kg) E = mL
change in thermal energy (J)
mass (kg) × specific heat capacity (J/kg°C) × change in temperature (°C) E = mCΔT
