forces/stopping distance p1&2

• Contact force


  Force when objects physically touch (friction)
• Non-contact force


  Force when not touching (magnet, electrostatic, gravity)
• Vector quantity


  • Has magnitude and direction
• Scalar quantity


  • Only has magnitude (size of force)
• Weight


  The force that gravity pulls on an object down
• Work done


  Energy transferred by a force
• Speed


  Distance / Time
• Newton's 1st Law


  • If no resultant force, then force remains constant
• Newton's 2nd Law


  • Mass is directly proportional to acceleration
• Newton's 3rd Law


  • Every force has an equal and opposite force
• Stopping distance


  Thinking distance + Braking distance
• Factors affecting thinking distance

  • Speed (proportional)
  • Distractions
  • Alcohol
  • Drugs
  • Tiredness
• Factors affecting braking distance

  • Road conditions
  • Tyres
  • Load
  • Weather conditions
• Momentum


  Measurement of mass in motion