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Stretching springs

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS2-2, NGSS.HS-PS2-1 · England: KS3 Physics: Motion and forces (forces and elasticity), GCSE Combined Science: Forces (required practical: force and extension)

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  1. Question 1

    Two springs are stretched by the same force. Spring A stretches less than B. Which has the larger spring constant?

    • A. they are equal
    • B. spring B
    • C. spring A (it is stiffer)
    • D. it cannot be known

  2. Question 2

    A spring is 12 cm long. When a weight is hung on it, it is 17 cm long. What is the extension, in cm?

    Answercm

  3. Question 3

    A spring has a spring constant of 200 N/m. What force is needed to stretch it by 10 cm, in N? (F = k × e, with e in metres)

    AnswerN

  4. Question 4

    What does it mean if a spring goes past its elastic limit?

    • A. It will not return to its original length when the force is removed
    • B. Its spring constant doubles
    • C. It snaps back faster
    • D. It becomes stronger

  5. Question 5

    A spring is 20 cm long. When a weight is hung on it, it is 23 cm long. What is the extension, in cm?

    Answercm

  6. Question 6

    A force of 2 N stretches a spring by 4 cm. What is the spring constant, in N/m?

    AnswerN/m

  7. Question 7

    Two springs are stretched by the same force. Spring A stretches less than B. Which has the larger spring constant?

    • A. they are equal
    • B. spring B
    • C. spring A (it is stiffer)
    • D. it cannot be known

  8. Question 8

    A spring is 15 cm long. When a weight is hung on it, it is 19 cm long. What is the extension, in cm?

    Answercm

  9. Question 9

    A spring has a spring constant of 20 N/m. What force is needed to stretch it by 10 cm, in N? (F = k × e, with e in metres)

    AnswerN

  10. Question 10

    A spring obeys Hooke's law. What happens to the extension if the force is doubled?

    • A. it halves
    • B. it stays the same
    • C. it quadruples
    • D. it doubles

  11. Question 11

    A spring is 10 cm long. When a weight is hung on it, it is 13 cm long. What is the extension, in cm?

    Answercm

  12. Question 12

    A force of 2 N stretches a spring by 5 cm. What is the spring constant, in N/m?

    AnswerN/m

  13. Question 13

    Two springs are stretched by the same force. Spring A stretches less than B. Which has the larger spring constant?

    • A. they are equal
    • B. spring A (it is stiffer)
    • C. it cannot be known
    • D. spring B

  14. Question 14

    A spring is 25 cm long. When a weight is hung on it, it is 29 cm long. What is the extension, in cm?

    Answercm

  15. Question 15

    A force of 0.4 N stretches a spring by 2 cm. What is the spring constant, in N/m?

    AnswerN/m

  16. Question 16

    A spring obeys Hooke's law. What happens to the extension if the force is doubled?

    • A. it doubles
    • B. it quadruples
    • C. it stays the same
    • D. it halves

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Answer key: Stretching springs

  1. 1. C. spring A (it is stiffer)

  2. 2. 5 cm

  3. 3. 20 N

  4. 4. A. It will not return to its original length when the force is removed

  5. 5. 3 cm

  6. 6. 50 N/m

  7. 7. C. spring A (it is stiffer)

  8. 8. 4 cm

  9. 9. 2 N

  10. 10. D. it doubles

  11. 11. 3 cm

  12. 12. 40 N/m

  13. 13. B. spring A (it is stiffer)

  14. 14. 4 cm

  15. 15. 20 N/m

  16. 16. A. it doubles