Question detail
Which of the following equations is used to calculate the force acting on a spring when it is stretched by a given extension?
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. F = k × e
- B. E = 0.5 × k × e²
- C. F = m × g
- D. E = m × c × Δθ
Answer
F = k × e
Explanation
The force on a spring is given by Hooke’s law, F = k × e, where k is the spring constant and e is the extension. The other equations calculate elastic potential energy, weight, or heat energy, not the force.
Common mistake
Confusing Calculations
Students often confuse force-extension calculations with elastic potential energy calculations, leading to incorrect results.
To fix this, clearly identify whether you are calculating force using Hooke's law (F = k * e) or elastic potential energy (Ee = 0.5 * k * e^2) and ensure you use the correct formula for each scenario.
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