Conservation Of Momentum
In an isolated system with internal impulsive forces, which is conserved?
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- conservation of momentum
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Total momentum
For an isolated system (where the net external force Fext=0), the total linear momentum is always conserved. Internal forces (like those during a collision or explosion) appear in equal and opposite pairs according to Newton's Third Law, so their net impulse on the entire system is zero. While internal forces can change the individual momenta of parts of the system and can change the system's kinetic energy (e.g., converting it to heat), the total ∑p remains constant.
This medium difficulty physics question is from the chapter laws of motion, covering the topic of conservation of momentum. It appeared in the 2025 exam.
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