Question detail
Forces and elasticity scenario: a force acts at a measured perpendicular distance from a pivot. Which answer best addresses Stretching and deformation and the objective to distinguish extension from total length in practical measurements?
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 lever balance scenario, apply extension to distinguish extension from total length in practical measurements while keeping elastic versus plastic deformation separate.
- B. In the lever balance 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 distinguish extension from total length in practical measurements.
Answer
The correct answer is: In the lever balance scenario, apply extension to distinguish extension from total length in practical measurements while keeping elastic versus plastic deformation separate.
Explanation
The correct option is In the lever balance scenario, apply extension to distinguish extension from total length in practical measurements while keeping elastic versus plastic deformation separate.. It is correct because the scenario says a force acts at a measured perpendicular distance from a pivot, which must be interpreted through Stretching and deformation. This directly supports the learning objective to distinguish extension from total length in practical measurements. Use values 7, 11, and 18 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
Confusing total length with extension
Students often treat the measured length of a stretched spring as the extension, rather than subtracting the original length to find the change in length.
Remind students that extension (ΔL) is the difference between the stretched length and the original length: ΔL = L_stretched – L_original. Always record both lengths and calculate the extension separately before using it in Hooke’s law or energy equations.
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