GCSE Physics (AQA)

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Road Conditions

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Forces Forces and motion

Road Conditions

2:57 Saftey when Stopping
Spec 4.5.6.3.3
Previous Vehicle Conditions Next Momentum
  • Braking forces depend on friction between the road and car tires.
  • Applying brakes stops tire spinning, increasing friction and slowing the car.
  • Reduced friction increases braking distance, the distance a car travels after braking before stopping.
  • Overall stopping distance includes braking distance.
  • Less friction results in less deceleration and longer stopping time.
  • Wet roads reduce friction due to water acting as a lubricant, increasing braking distance.
  • Drivers should be cautious in rain; icy roads reduce friction even more.
  • Ice causes weak frictional forces, leading to long braking distances.
  • Drivers should drive slowly or avoid icy roads.
  • Road surface type affects braking force effectiveness.
  • Concrete roads have rough surfaces for more friction, allowing faster speeds and shorter braking distances.
  • Dirt roads have less friction, requiring slower, more careful driving.
  • Understanding road conditions is important for recalling and explaining their impact on stopping distances.

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