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9th grade energy

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.MS-PS3-1, NGSS.MS-PS3-2, NGSS.HS-PS3-1, NGSS.HS-PS3-2 · England: KS4 Combined Science: Energy, KS3 Physics: Energy (calculation of fuel uses and costs), GCSE Combined Science: Energy (national and global energy resources)

Name

Date

Score/ 16

  1. Question 1

    An object of mass 5 kg is lifted 5 m. How much gravitational potential energy does it gain? Use Eₚ = m g h with g = 9.8 N/kg.

    AnswerJ

  2. Question 2

    A motor is 35% efficient. It is supplied with 1500 J. How much useful energy does it transfer, in J?

    AnswerJ

  3. Question 3

    What is the kinetic energy of a 80 kg object moving at 4 m/s? Use Eₖ = ½ m v².

    AnswerJ

  4. Question 4

    A device is supplied with 2500 J and transfers 2000 J usefully. What is its efficiency, as a percentage?

    Answer%

  5. Question 5

    Can a device be more than 100% efficient?

    • A. Yes, if it is new
    • B. Yes, if it uses a battery
    • C. Yes, if it is very small
    • D. No, because energy cannot be created

  6. Question 6

    An appliance transfers 400 J of energy in 10 s. What is its power, in watts?

    AnswerW

  7. Question 7

    What is the main drawback of wind and solar power?

    • A. They need uranium
    • B. They release lots of carbon dioxide while running
    • C. Their output varies with the weather and time of day
    • D. They will run out soon

  8. Question 8

    A force of 10 N pushes a box 5 m along the floor. How much work is done, in J?

    AnswerJ

  9. Question 9

    A 0.1 kW heater is used for 3 hours. Electricity costs 20 cents (pence) per kWh. How much does it cost to run, in cents (pence)?

    Answer

  10. Question 10

    Is this energy resource renewable or non-renewable: wave power?

    • A. renewable
    • B. non-renewable

  11. Question 11

    In one year a country generated 250 TWh of electricity. Renewables supplied (TWh): wind 72.5, solar 20, hydroelectric 25. What percentage of the electricity came from these renewables?

    Answer%

  12. Question 12

    A ball is dropped from 10 m. Ignoring air resistance, all its gravitational potential energy becomes kinetic energy. How fast is it moving just before it lands, in m/s? Use g = 10 N/kg.

    Answerm/s

  13. Question 13

    An object of mass 50 kg is lifted 25 m. How much gravitational potential energy does it gain? Use Eₚ = m g h with g = 9.8 N/kg.

    AnswerJ

  14. Question 14

    A motor is 40% efficient. It is supplied with 500 J. How much useful energy does it transfer, in J?

    AnswerJ

  15. Question 15

    What is the kinetic energy of a 10 kg object moving at 4 m/s? Use Eₖ = ½ m v².

    AnswerJ

  16. Question 16

    A device is supplied with 400 J and transfers 320 J usefully. What is its efficiency, as a percentage?

    Answer%

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Answer key: 9th grade energy

  1. 1. 245 J

  2. 2. 525 J

  3. 3. 640 J

  4. 4. 80 %

  5. 5. D. No, because energy cannot be created

  6. 6. 40 W

  7. 7. C. Their output varies with the weather and time of day

  8. 8. 50 J

  9. 9. 6

  10. 10. A. renewable

  11. 11. 47 %

  12. 12. 14.1 m/s

  13. 13. 12250 J

  14. 14. 200 J

  15. 15. 80 J

  16. 16. 80 %