Question detail
Momentum scenario: a gear changes turning effect and rotation speed. Which answer best addresses Momentum and conservation of momentum (HT only) and the objective to (HT only) Use the equation momentum = mass x velocity?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Momentum
Question
- A. In the gear system scenario, apply mass to (HT only) Use the equation momentum = mass x velocity while keeping mass versus weight separate.
- B. In the gear system scenario, mix up mass versus weight and ignore mass.
- C. Use a general revision statement without applying Momentum and conservation of momentum (HT only) to the situation.
- D. Choose a different forces topic instead of explaining (HT only) Use the equation momentum = mass x velocity.
Answer
The correct answer is: In the gear system scenario, apply mass to (HT only) Use the equation momentum = mass x velocity while keeping mass versus weight separate.
Explanation
The correct option is In the gear system scenario, apply mass to (HT only) Use the equation momentum = mass x velocity while keeping mass versus weight separate.. It is correct because the scenario says a gear changes turning effect and rotation speed, which must be interpreted through Momentum and conservation of momentum (HT only). This directly supports the learning objective to (HT only) Use the equation momentum = mass x velocity. Use values 3, 15, and 20 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error mass versus weight.
Common mistake
Misidentifying momentum as kinetic energy
Students often confuse momentum (p = mv) with kinetic energy (Ek = ½mv²) and use the wrong formula when calculating momentum.
Remember that momentum is a vector quantity given by p = m × v, while kinetic energy is a scalar given by Ek = ½ m v². Use the correct formula based on the question’s requirement.
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