Question detail
In a closed system, two objects collide. If object A has a momentum of 10 kg·m/s and object B has a momentum of -5 kg·m/s, what is the total momentum of the system before the collision Explain your answer using Momentum and conservation of momentum (HT only) and momentum.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Momentum
Question
In a closed system, two objects collide. If object A has a momentum of 10 kg·m/s and object B has a momentum of -5 kg·m/s, what is the total momentum of the system before the collision Explain your answer using Momentum and conservation of momentum (HT only) and momentum.
Answer
The total momentum of the system is 5 kg·m/s.
Explanation
A strong answer should address (HT only) State that momentum is conserved in a closed system directly. Use the context of Momentum and conservation of momentum (HT only) within Momentum, then state the relevant forces or motion reasoning with units where needed. The answer is correct when it names the key physics quantity, keeps moment and force distinct, and links the conclusion back to the approved learning objective.
Common mistake
Momentum Conservation Misunderstanding
Students often think that momentum is not conserved if the objects collide and stick together.
Emphasize that momentum is always conserved in a closed system, regardless of whether the objects stick together or bounce apart.
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