GCSE Combined Science (AQA)

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Colliding & Sticking

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Forces Momentum

Colliding & Sticking

4:21 Using the Conservation of Momentum
Spec 4.5.7.2
Previous Explosions & Recoil Next Gravitational Potential Energy
  • Objects can stick and move together after a collision.
  • Demonstrated using two people on roller skates colliding and then moving together.
  • They may stick together by grabbing each other or one pushing the other.
  • Post-collision, they move with the same velocity.
  • Analyzing their momentum, they can be considered as a single object.
  • Momentum, a product of mass and velocity, is conserved in a closed system.
  • Before and after the collision, total momentum remains the same.
  • If two objects have equal and opposite momentum and collide, they can stop completely.
  • Example given with two cars colliding with equal and opposite momentum, resulting in no motion post-collision.
  • Total momentum before and after the collision is zero, explaining why the cars stop.
  • Momentum conservation also applies when objects bounce off each other with equal and opposite momentum.
  • Important for exams to explain how and why momentum is conserved, rather than predicting the outcomes of collisions.

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