GCSE Physics (AQA)

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Dangers of Large Decelerations

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Forces Forces and motion

Dangers of Large Decelerations

3:10 Saftey when Stopping
Spec 4.5.6.3.4
Previous Stopping Distance & Speed Next Scalars & Vectors
  • Larger braking force results in shorter braking distance for a given speed.
  • Braking force is created by brakes pressing against tires, stopping them from spinning and creating friction with the road.
  • Example: A car with a braking force of 2 kilonewtons has a braking distance of 24 meters.
  • A second car with a braking force of 6 kilonewtons has a braking distance of 8 meters due to more pressure on the brake pedal or better brake condition.
  • Shorter braking distance reduces the chance of hitting a hazard.
  • Applying too large a braking force can cause loss of vehicle control.
  • Brakes stop tires from spinning, creating friction, but can cause tires to slide if applied too hard.
  • On roads with less friction, tires can't grip properly, leading to skidding.
  • Drivers should gradually apply brakes to prevent sliding and skidding.
  • Large braking force can cause brakes to overheat.
  • Brakes transfer kinetic energy to thermal energy, heating up when applied.
  • Excessive heat from heavy braking can damage brakes as components burn or deform.
  • Understanding the dangers of large braking forces, including skidding and overheating, is important for exams.

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