AQA GCSE Physics Equations Weight (W) W = mg weight = mass x gravitational field strength Work Done (W) W = Fs work done= force x distance Force (F) on a spring F = ke force = spring constant x extension Moment (M) M = fd moment = force x distance from pivot Pressure (p) P=𝐴 𝐹 pressure = force ÷ area Distance (s) s = vt distance = speed x time Acceleration (a) a= Resultant Force (F) Momentum (p) F = ma force = mass x acceleration p = mv momentum = mass x velocity Kinetic Energy (Ek) Gravitational Potential Energy (Ep) Power (P) ∆𝑣 𝑡 acceleration = change in velocity ÷ time Ek = ½ mv2 kinetic energy = 0.5 x mass x (speed)2 Ep = mgh gravitational potential energy = mass x gravity x height 𝐸 power = energy transferred ÷ time 𝑊 𝑡 power = work done ÷ time P=𝑡 Power (P) P= Energy Transferred (E) Efficiency E = Pt Efficiency = Useful energy output Total energy input Efficiency Efficiency = Useful power output Total power input Energy Transferred = power x time Wave Speed (v) v = fλ wave speed = frequency x wavelength Charge (Q) Q = It charge flow = current x time Potential Difference (V) Power (P) (electrical) Power (P) (electrical) Energy Transferred (E) (electrical) Density (ρ) V = IR potential difference = current x resistance P = IV power = current x potential difference P = I2R power = (current)2 x resistance E = QV energy = charge x potential difference ρ= m v density = mass ÷ volume