Question detail
In the equation for elastic potential energy, what does the term 'extension' refer to?
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. The total length of the spring
- B. The increase in length of the spring when stretched
- C. The force applied to the spring
- D. The spring constant
Answer
The increase in length of the spring when stretched
Explanation
Extension is defined as the increase in length of an object when a stretching force is applied.
Common mistake
Misunderstanding Elastic Potential Energy
Students often think that doubling the extension of a spring will double the elastic potential energy stored in it.
Students should understand that elastic potential energy is proportional to the square of the extension, so doubling the extension actually increases the energy by a factor of four.
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