Physics required equations

• Weight = mass × gravitational field strength

  W = mg
• Work done = force × distance (along line of action)

  W = Fs
• Force applied to spring = spring constant × extension

  F = ke
• Moment of force = force × distance (normal to force direction)

  M = Fd
• Pressure = force (normal to surface) ÷ area of surface

  p = F ÷ A
• Distance travelled = speed × time

  s = vt
• Acceleration = change in velocity ÷ time taken

  a = ◇v ÷ t
• Resultant force = mass × acceleration

  F = ma
• Momentum = mass × velocity

  p = mv
• Kinetic energy = ½ × mass × (speed)²

  E = ½mv²

  k
• Gravitational potential energy = mass × gravitational field strength × height

  E = mgh

  p
• Power = energy transferred ÷ time

  p = E ÷ t
• Power = work done ÷ time

  p = W ÷ t
• Efficiency = useful output energy ÷ total input energy
• Efficiency = useful power output ÷ total power input
• Wave speed = frequency × wavelength

  v = f/

  ^
• Charge flow = current × time

  Q = It
• Potential difference = current × resistance

  V = IR
• Power = potential difference × current

  P = VI
• Power = (current)² × resistance

  P = I²R
• Energy transferred = power × time

  E = Pt
• Energy transferred = charge flow × potential difference

  E = QV
• Density = mass ÷ volume

  p = m ÷ V
• What is gravity on earth 


  10m/s²
• Elastic potential energy = ½ × spring constant × extension²
• Magnification = image size ÷ actual size