IB Physics SL A 2 16 Linear Momentum Conservation Questions
Practise IB Physics SL A.2.16 by calculating momentum before and after collisions and applying conservation in isolated systems.
- Syllabus
- First assessment 2025
- Course
- Physics SL
- Level
- SL
Exam points
- Calculate linear momentum from mass and velocity, including its direction.
- Use conservation of momentum to find a post-collision velocity or combined mass speed.
- State the external-force condition required for momentum to remain constant.
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IB Physics SL A 2 16 Linear Momentum Conservation Questions question 1
[Maximum number: 2]
Assuming that the lithium-7 nucleus in (b) is at rest, suggest why, in terms of conservation of momentum, the neutron initiating the reaction must have an energy greater than 2.5 MeV .
2.5 MeV must be converted to mass (in the interaction) / otherwise the products would not be moving;
(to conserve momentum) final products must have total momentum equal to that of incoming neutron (so extra energy is required) / OWTTE;
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