Physics

• Coulomb's Law


  Formula describing the force between two charged particles
• Mass

  • Proton: 1.673×10-27 kg
  • Neutron: 1.675×10-27 kg
  • Electron: 9.109x10-31 kg
• Charge

  • Proton: 1.602 x 10-19 C
  • Electron: -1.602 x 10-19 C
• Coulomb's Law Formula: F = k (q1*q2)/r^2
• Coulomb's Constant


  k = 9x10^9 N·m^2/C^2
• F = ma (Newton's Second Law)
• Cosine Law: c^2 = a^2 + b^2 - 2ab*cos(C)
• Quadratic Formula: x = (-b ± √(b^2 - 4ac)) / 2a
• Electrostatic Force: Attraction (unlike charges), Repulsion (like charges)
• Methods of Charging

  1. Friction

  2. Conduction

  3. Induction
• Triboelectric Series

  • Rabbit fur
  • Glass
  • Mica
  • Wool
  • Silk
  • Paper
  • Fur
  • Amber
• Electric Field: Region surrounding a charged body
• Electric Flux


  Flow of the electric field through a surface
• Gauss's Law: ∮E·dA = Q_enclosed/ε_0
• Electric Permittivity of Free Space: ε_0 = 8.85×10^-12 F/m