P10 - Forces and Motion

• Newtons 2nd Law: Force = mass x acceleration (F = ma)
• Inertia - resultant force is needed to change a velocity
• Terminal velocity - The maximum velocity an object can achieve when moving
• Stopping distance = thinking distance + breaking distance
• Factors that affect thinking distance:

  • Distractions
  • Alcohol
  • Tiredness
• Factors that affect breaking distance:

  • Conditions of brakes
  • Road surface
  • Weather
• Hookes Law - Force is proportional to the extension of a spring
• Extension = new length - original length
• • Momentum = mass x velocity
  • Momentum is always conserved within a closed system
  • (Mass of Object A + Velocity of Object A) + (Mass of Object B + Velocity of Object B) = 0