Question detail
Forces and elasticity scenario: a passenger is brought to rest over a longer stopping time. Which answer best addresses Stretching and deformation and the objective to identify the limit of proportionality on a force-extension graph?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Forces and elasticity
Question
- A. In the seat belt scenario, apply extension to identify the limit of proportionality on a force-extension graph while keeping elastic versus plastic deformation separate.
- B. In the seat belt scenario, mix up elastic versus plastic deformation and ignore extension.
- C. Use a general revision statement without applying Stretching and deformation to the situation.
- D. Choose a different forces topic instead of explaining identify the limit of proportionality on a force-extension graph.
Answer
The correct answer is: In the seat belt scenario, apply extension to identify the limit of proportionality on a force-extension graph while keeping elastic versus plastic deformation separate.
Explanation
The correct option is In the seat belt scenario, apply extension to identify the limit of proportionality on a force-extension graph while keeping elastic versus plastic deformation separate.. It is correct because the scenario says a passenger is brought to rest over a longer stopping time, which must be interpreted through Stretching and deformation. This directly supports the learning objective to identify the limit of proportionality on a force-extension graph. Use values 2, 6, and 13 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 elastic versus plastic deformation.
Common mistake
Limit of Proportionality Confusion
Students often confuse the limit of proportionality with the elastic limit, thinking they are the same point on a force-extension graph.
Clarify that the limit of proportionality is where the extension stops being directly proportional to the force, while the elastic limit is where the material will not return to its original shape.
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