Force of Gravity on Earth

• Force of gravity on earth discussion
  • proportional to mass
  • determine proportionality constant lab or demo
  • g=9.8 N/kg equivalent to 9.8 m/s²
  • why things accelerate at 9.8 m/s² in free fall
    • FBD of free fall
    • SF=ma
• Weight
  • w=Fg=mg
  • Apparent Weight is equal in magnitude to the Normal Force
    • apparent weightlessness
      • astronaut training
  • Accelerating Elevator with a mass on a spring scale example