Newtons 2nd Law

Newtons 2nd Law

• The acceleration of a body is inversely proportional to its mass and directly proportional to the resultant of the external forces acting on it.
  • develop F=ma from proportionalities
    • What does proportional mean?
    • What is a proportionality constant?
    • How can we get rid of a proportionality constant?
      • SI units for F=ma
  • What do we mean by resultant of external forces
    • What is an external force?
      • Magnet car p46 example
      • FBD handling of external forces
    • resultant means sum of
      • use SF=ma
      • how to solve force problems
        • draw FBD
        • sum forces
        • apply SF=ma