 # GCSE Combined Science Equations

Flashcards by Indigo Gray, updated more than 1 year ago 4 0 0

### Description

The equations to know for Combined Science at GCSE level. ## Resource summary

 Question Answer Power (electricity) P = VI power (watts) = potential difference (volts) x current (amps) Power (electricity 2) P = I^2xR power (watts) = current^2 (amps) x resistance (ohms) Energy Transferred (power) E = Pt Energy transferred (joules) = power (watts) x time (seconds) Density p = m/v Density (kg/m^3) = mass (kg) / volume (meters^3) 1 Energy Transferred (charge) E = QV Energy transferred (joules) = charge flow (coulombs) x potential difference (volts) 2 Energy Transferred (change) E = ItV Energy transferred (joules) = [current (amps) x time (seconds)] x potential difference (volts) Weight W = mg Weight (newtons) = mass (kg) x gravitational field strength (newtons/kg) Work Done W = fd Work done (joules) = force (newtons) x distance (metres) Force Applied to Spring F = ke Force (newtons) = spring constant (newtons/metre) x extension (metre) Distance Travelled S = vt Distance travelled (metres) = speed (metres/second) x time (second) Pressure p = F/A Pressure (newtons/metres^2) = force [normal to surface] (newtons) / area (metres^2) Moment of a Force M = Fd Moment (newton metres) = force [normal to direction of force] (newtons) x distance (metres) Acceleration a = Δv/t Acceleration (metres/second^2) = change in velocity (metres/second) / time (seconds) Resultant Force F = ma Resultant force (newtons) = mass (kg) x acceleration (metres/second^2) Momentum p = mv Momentum (kg m/s) = mass (kg) x velocity (m/s) Kinetic Energy KE = (1/2) m v^2 Kinetic energy (joules) = 1/2 x mass (kg) x velocity^2 (metres/second) Gravitational Potential Energy GPE = mgh GPE (joules) = mass (kg) x gravitational field strength (newtons/kg) x height (metres) Power (energy) P = E/t Power (watts) = energy transferred (joules) / time (seconds) Power (work done) P = W/t Power (watts) = work done (joules) / time (seconds) Efficiency (energy) Efficiency = useful output energy / total input energy Efficiency (power) Efficiency = useful power input / total power output Wave Speed V = fλ Wave speed (metres/second) = frequency (hertz) x wavelength (metres) Charge Flow Q = It Charge flow (coulombs) = current (amps) x time (seconds) Potential Difference V = IR Potential difference (volts) = current (amps) x resistance (ohms)

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