[熱身賽第一輪] 線性動量守恆 [Warm-up Round 1] Conservation of Linear Momentum

unit: Linear Momentum topic: Conservation of Linear Momentum learning objective: Describe how the selection of a system determines whether the momentum of that system changes. essential knowledge: Momentum is conserved in all interactions. If the net external force on the chosen system is zero, the total momentum remains constant; if the net external force is nonzero, momentum is transferred between the system and its environment.