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Verify the conservation of momentum law, therefore find change in kinetic energy and momentum 0.

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Momentum and energy changes in one-dimensional collisions

Physics HL


Conservation of momentum is one of the most important and universal of the conservation laws of physics; it holds true even in situations where modern theories of physics apply. That is amazingly useful because it means that ONE can tell what is going to happen after a collision before it has taken place.

Law of conservation of momentum: when two or more objects act on each other, their total momentum remains constant, provided no external forces are acting.

Law of conservation of energy: Energy is never destroyed; it is just converted from one form to another. body in motion possesses kinetic energy.The kinetic energy possessed by a body depends on itsmassand itsspeed.

Purpose: To verify the laws stated above, therefore find change in kinetic energy and momentum 0.


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Momentum of a body of mass m, moving with velocityimage09.png, is given by p=mv.image08.jpg

The units of momentum are kgms-1

i.e                                 m1v1 + m2v2 = m1v1 + m2v2




E.g. Total momentum= mass x velocity of trolley A + mass x velocity of trolley B

                                      200 g .                                +  200g  .      

Law of conservation of momentum,

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  • Take uncertainty of 1% in every single piece of data, final result will then be a lot more accurate, but time limits.
  • Make more trials to verify laws, more than 4 times at least.
  • Take uncertainty in consideration more carefully following rules of finding uncertainties.
  • Describe method in more details so that anyone can follow it.
  • Make sure there are no time limits next time.
  • Draw more diagrams to show apparatus after each step.

...read more.

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