Nature of Force

• definition of force
  • push or pull
  • What is it? - Can we see it?
• what is mass?
  • inertia - ability to resist change in velocity
  • difference between mass and weight - balance , spring scale
  • basic unit of mass - kg (notice it is not a gram)
• fundamental forces
  • What types of force are there?
    • great link to explain the type and relative strength of the four fundamnental forces.
    • electromagnetic - distinguish between electric and magnetic forces
      • unification of these forces
      • great link toexplainthe theory of everything
  • relative strength of these forces
  • What about contact forces?
    • applied, normal, friction, tension, compression, aerodynamic, hydrodynamic etc.
• Unit of Force
  • Named after Newton, symbol F units (N)
  • relationship to fundamental units