Question detail
Forces and elasticity scenario: a passenger is brought to rest over a longer stopping time. Which answer best addresses Required practical: force and extension and the objective to calculate extension by subtracting original length from stretched length?
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 calculate extension by subtracting original length from stretched length 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 Required practical: force and extension to the situation.
- D. Choose a different forces topic instead of explaining calculate extension by subtracting original length from stretched length.
Answer
The correct answer is: In the seat belt scenario, apply extension to calculate extension by subtracting original length from stretched length while keeping elastic versus plastic deformation separate.
Explanation
The correct option is In the seat belt scenario, apply extension to calculate extension by subtracting original length from stretched length 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 Required practical: force and extension. This directly supports the learning objective to calculate extension by subtracting original length from stretched length. Use values 5, 7, and 19 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
Common Mistake in Extension Calculation
Students often forget to convert the original length and stretched length into the same units before subtracting to find the extension.
Always ensure that both lengths are in the same unit (e.g., both in meters) before performing the subtraction to calculate the extension.
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