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Momentum

Momentum. Summary. Momentum is a fundamental quantity in physics SI Unit: kg.m/s It is a vector Newton’s law can be written Or Impulse (=change of momentum) can be written. Total momentum of an isolated system is conserved

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Momentum

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  1. Momentum Summary PHY231

  2. Momentum is a fundamental quantity in physics • SI Unit: kg.m/s • It is a vector • Newton’s law can be written • Or • Impulse (=change of momentum) can be written PHY231

  3. Total momentum of an isolated system is conserved • System for us will always mean two objects interact with one another (for example through collision) and during that interaction you can apply the concept of conservation of the total momentum • Total momentum for us means sum over the momentum for two objects . This sum must be the same before and after the objects interacted. • Isolated means the only force that really does anything interesting is the force between the two objects, the sum over all the other forces on each object must be zero

  4. Two special types of collisions • Perfectly inelastic = the objects have the same velocity after the collision • Elastic = The total kinetic energy of the two objects is also conserved • So, anytime you hear “collisions” you should use • Inelastic (nothing special) • Perfectly inelastic • Elastic PHY231

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