GCSE Physics (AQA)

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Momentum & Safety

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Forces Momentum

Momentum & Safety

3:30 Force as Change of Momentum
Spec 4.5.7.3
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  • A force stopping an object causes it to lose all momentum.
  • Momentum is the product of mass and velocity.
  • Stopping an object requires it to lose all momentum.
  • Sudden stops cause pain due to large forces acting on the body.
  • Resultant force equals the rate of change of momentum (F = delta P / delta T).
  • Sudden momentum change implies short time, resulting in large force.
  • Large forces can damage bones.
  • Longer stopping time reduces force needed.
  • Bending knees during a fall slows momentum loss, reducing leg damage.
  • Rolling further spreads momentum change, reducing force.
  • Safety equipment increases stopping time to reduce force.
  • Bicycle helmets cushion impacts, reducing force on the head.
  • Protective clothing like shin pads and arm guards work similarly.
  • Gym mats compress to extend reaction force duration, reducing stopping force.
  • Similar mats are used in playgrounds and athletics fields.
  • Understanding these principles is important for exams.

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