Formulas

• Weight = mass x gravitational field strength

  W = m g
• Work done = force x distance

  W = F s
• Force = spring constant x extension

  F = k e
• Distance = velocity x time

  s = v t
• Acceleration = change in velocity / time

  a = Δ v / t
• Force = mass x acceleration

  F = m a
• Momentum = mass x velocity

  p = m v
• Kinetic energy = 0.5 x mass x ( velocity ) ^2

  Ek = 0.5 m v^2
• Gravitational potential energy = mass x gravitational field strength x height

  Ep = m g h
• Power = energy transferred / time

  P = E / t
• Power = work done / time

  P = W / t
• Efficiency = useful output energy transfer / total input energy transfer = useful power output / total power input
• Wave speed = frequency x wave length

  v = f λ
• Charge flow = current x time

  Q = I t
• Potential difference = current x resistance

  V = I R
• Power = potential difference x current

  P = V I
• Power = current^2 x resistance

  P = I^2 R
• Energy transferred = power x time

  E = P t
• Energy transferred = charge flow x potential difference

  E = Q V
• Density = mass / volume

  p = m / V