Forces on a Vehicle

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  • Created by: Annie
  • Created on: 11-12-13 18:23
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  • Forces on a Vehicle
    • The stopping distance of a car depends on two factors - thinking distance and braking distance.
      • Under normal driving conditions, the thinking and braking distance depend on the speed of the car.
    • On A Car moving at a steady speed..
      • Gravity pulls down on the car
      • The reaction force from the road pushes up on the wheels
      • The driving force from the engine pushes the car along
      • There is friction between the road and the tyres
      • There is friction between the road and the tyres
    • Speeding Up
      • Gravity and the reaction force from the road are balanced – they are equal and opposite
      • The driving force from the engine is greater than the resistive forces (friction between the road and the tyres, and air resistance acting on the body of the car)
    • Slowing Down
      • The driving force from the engine must be reduced
      • The resistive forces must be increased
    • Thinking Distance
      • stopping distance = thinking distance + braking distance

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