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Mechanical Engineering QUESTION #2525
Question 1
Conservation of linear momentum applies to a system of particles when:
  • Kinetic energy is conserved
  • The net external force on the system is zero: \(\sum\mathbf{F}_{ext}=0\)✔️
  • All particles move with the same velocity
  • The system has no angular momentum
Correct Answer Explanation
Linear momentum of a system \(\mathbf{G}=\sum m_i\mathbf{v}_i\) satisfies \(\frac{d\mathbf{G}}{dt}=\sum\mathbf{F}_{ext}\). When \(\sum\mathbf{F}_{ext}=0\), \(\mathbf{G}\) is conserved.