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Grade 9 · Physics

Grade 9 Energy, work & power worksheet

20 questions on energy, work & power. The answer key is a separate download.

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What is on the worksheet

  1. A 13 kg object changes speed from 17 m/s to 19 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  2. A model device transfers energy at constant power 520 W for 39 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

  3. A 15 kg object changes speed from 18 m/s to 15 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  4. A model device transfers energy at constant power 205 W for 8 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

  5. A device receives 1230 J and has useful-energy efficiency 30%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  6. A device receives 170 J and has useful-energy efficiency 15%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  7. A 8 kg load is raised vertically by 4 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

  8. A device receives 670 J and has useful-energy efficiency 85%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  9. A device receives 460 J and has useful-energy efficiency 85%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  10. A model device transfers energy at constant power 1000 W for 80 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

  11. A model device transfers energy at constant power 1000 W for 25 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

  12. A device receives 310 J and has useful-energy efficiency 10%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  13. A 26 kg load is raised vertically by 10 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

  14. A 3 kg object changes speed from 14 m/s to 25 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  15. A device receives 310 J and has useful-energy efficiency 55%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  16. A 33 kg load is raised vertically by 1 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

  17. A model device transfers energy at constant power 735 W for 13 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

  18. A 3 kg object rises 4 m where g = 10 N/kg. Find gravitational potential-energy increase.

  19. A device receives 100 J and has useful-energy efficiency 60%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  20. A 13 kg object changes speed from 16 m/s to 30 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

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