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Grade 11 · Physics

Grade 11 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 11 kg object changes speed from 12 m/s to 15 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  2. A constant 92 N force acts through a 29 m displacement. The cosine of the angle between them is -1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

  3. A 6 kg object changes speed from 4 m/s to 2 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  4. A device receives 980 J and has useful-energy efficiency 90%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  5. An ideal linear spring has k = 700 N/m and extension 37 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.

  6. A constant 18 N force acts through a 8 m displacement. The cosine of the angle between them is -1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

  7. A constant 51 N force acts through a 30 m displacement. The cosine of the angle between them is 1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

  8. A device receives 1340 J and has useful-energy efficiency 15%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  9. A device receives 1090 J and has useful-energy efficiency 65%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  10. A 9 kg object changes speed from 9 m/s to 19 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  11. A 19 kg object changes speed from 7 m/s to 30 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  12. A 9 kg object changes speed from 10 m/s to 2 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

  13. A constant 91 N force acts through a 26 m displacement. The cosine of the angle between them is 1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

  14. A constant 72 N force acts through a 4 m displacement. The cosine of the angle between them is 1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

  15. 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.

  16. A device receives 1320 J and has useful-energy efficiency 60%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  17. An ideal linear spring has k = 190 N/m and extension 15 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.

  18. An ideal linear spring has k = 570 N/m and extension 9 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.

  19. A device receives 880 J and has useful-energy efficiency 25%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

  20. A constant 12 N force acts through a 16 m displacement. The cosine of the angle between them is -0.5. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

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