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7th grade forces and motion

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS2-4, NGSS.HS-PS2-4, NGSS.MS-PS2-2, NGSS.HS-PS2-1 · England: KS3 Physics: Motion and forces (forces), KS4 Combined Science: Forces, KS3 Physics: Motion and forces (pressure)

Name

Date

Score/ 16

  1. Question 1

    A force of 2 N stretches a spring by 8 cm. What is the spring constant, in N/m?

    AnswerN/m

  2. Question 2

    A graph of force against extension is a straight line through the origin. What does this show?

    • A. Extension does not depend on force
    • B. Force and extension are directly proportional
    • C. The spring has passed its elastic limit
    • D. The spring is broken

  3. Question 3

    An astronaut's mass is 40 kg. Gravitational field strength on Mars is 3.7 N/kg. What would their weight be there, in N?

    AnswerN

  4. Question 4

    A spring is 20 cm long. When a weight is hung on it, it is 22 cm long. What is the extension, in cm?

    Answercm

  5. Question 5

    A walker has a weight of 600 N. The total area in contact with the ground is 0.03 m². What pressure is exerted on the ground, in Pa?

    AnswerPa

  6. Question 6

    Mass and weight: which statement is NOT true?

    • A. Mass and weight are the same thing.
    • B. Your mass is the same on the Moon as on Earth.
    • C. Weight is a force measured in newtons.
    • D. Mass is measured in kilograms.

  7. Question 7

    What is the weight of a 2 kg object on Earth? Use g = 9.8 N/kg.

    AnswerN

  8. Question 8

    A force of 4 N acts on an area of 2 m². What is the pressure, in pascals (Pa)?

    AnswerPa

  9. Question 9

    Why are deep-sea submersibles built with very thick walls?

    • A. Water pressure increases greatly with depth
    • B. To make them float
    • C. Deep water is hotter
    • D. There is no pressure deep down

  10. Question 10

    A spring has a spring constant of 25 N/m. What force is needed to stretch it by 5 cm, in N? (F = k × e, with e in metres)

    AnswerN

  11. Question 11

    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 becomes stronger
    • D. It snaps back faster

  12. Question 12

    An astronaut's mass is 40 kg. Gravitational field strength on Mars is 3.7 N/kg. What would their weight be there, in N?

    AnswerN

  13. Question 13

    A spring is 12 cm long. When a weight is hung on it, it is 18 cm long. What is the extension, in cm?

    Answercm

  14. Question 14

    A car has a weight of 12000 N. The total area in contact with the ground is 0.08 m². What pressure is exerted on the ground, in Pa?

    AnswerPa

  15. Question 15

    Mass and weight: which statement is NOT true?

    • A. Your mass is the same on the Moon as on Earth.
    • B. Weight is measured in kilograms.
    • C. Mass is measured in kilograms.
    • D. Weight is a force measured in newtons.

  16. Question 16

    What is the weight of a 12 kg object on Earth? Use g = 9.8 N/kg.

    AnswerN

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Answer key: 7th grade forces and motion

  1. 1. 25 N/m

  2. 2. B. Force and extension are directly proportional

  3. 3. 148 N

  4. 4. 2 cm

  5. 5. 20000 Pa

  6. 6. A. Mass and weight are the same thing.

  7. 7. 19.6 N

  8. 8. 2 Pa

  9. 9. A. Water pressure increases greatly with depth

  10. 10. 1.25 N

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

  12. 12. 148 N

  13. 13. 6 cm

  14. 14. 150000 Pa

  15. 15. B. Weight is measured in kilograms.

  16. 16. 117.6 N