Forces & Elasticity Quiz
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5 questions, one answer each
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1. What happens to an object undergoing elastic distortion once the force is removed?
- A. It stays deformed permanently
- B. It returns to its original shape
- C. It breaks
- D. It gets heavier
2. Which equation correctly relates force and extension for a spring?
- A. F = k ÷ e
- B. F = k × e
- C. F = e ÷ k
- D. F = k + e
3. A spring has a spring constant of 25 N/m. What force is needed to extend it by 0.4 m?
- A. 6.25 N
- B. 10 N
- C. 25.4 N
- D. 100 N
4. What does the limit of proportionality represent on a force–extension graph?
- A. The point where the spring breaks
- B. The point beyond which extension is no longer proportional to force
- C. The natural length of the spring
- D. The maximum spring constant
5. A spring (k = 60 N/m, within the limit of proportionality) is stretched by 0.3 m. Using Eₑ = ½ke², what elastic potential energy is stored?
- A. 2.7 J
- B. 5.4 J
- C. 9 J
- D. 18 J