GCSE Physics — type the answer, see the working, get it right twice and it's mastered. Spaced repetition built in.
F = m × aForce = mass × accelerationW = m × gWeight = mass × 9.8p = m × vMomentum = mass × velocityF = Δp ÷ ΔtForce = change in momentum ÷ timeW = F × dWork done = force × distanceP = F ÷ APressure = force ÷ areaKE = ½mv²Kinetic energyGPE = mghGravitational PEP = E ÷ tPower = energy ÷ timeEff = Eu ÷ Et × 100Efficiency %E = m × c × ΔTSpecific heat capacityV = I × RVoltage = current × resistanceP = I × VPower = current × voltageP = I² × RPower (no V needed)E = P × tEnergy = power × timeQ = I × tCharge = current × timev = f × λwave speed = freq × wavelengthT = 1 ÷ fPeriod = 1 ÷ frequencyV₁÷V₂ = n₁÷n₂Transformer voltagesV₁×I₁ = V₂×I₂Transformer power