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Grade 8 · Physics · three levels

Grade 8 Energy, work & power worksheet in three levels

The same 20-question worksheet on energy, work & power in Support, Core and Challenge versions. Question by question, each version keeps the topic and changes the difficulty.

All three levels PDFAll three answer keysOriginal worksheet

Compare the three levels

Support

Easier questions on the same topics, for students who need more practice with the basics.

Questions
20 (20 medium)
Grade range
Grades 7 to 11
Topics
Energy, work & power

Sample questions

  1. A device receives 1000 J and has useful-energy efficiency 90%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.
  2. A device receives 1190 J and has useful-energy efficiency 70%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.
  3. A 14 kg load is raised vertically by 23 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

Core

Questions at the expected level for the grade.

Questions
20 (20 medium)
Grade range
Grades 7 to 11
Topics
Energy, work & power

Sample questions

  1. A device receives 1170 J and has useful-energy efficiency 35%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.
  2. A model device transfers energy at constant power 100 W for 19 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.
  3. A model device transfers energy at constant power 180 W for 13 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

Challenge

Harder questions on the same topics, for students who are ready to stretch.

Questions
20 (20 challenge)
Grade range
Grades 9 to 12
Topics
Energy, work & power

Sample questions

  1. A 12 kg object changes speed from 0 m/s to 27 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
  2. An ideal linear spring has k = 280 N/m and extension 22 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.
  3. A 1 kg object changes speed from 4 m/s to 21 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

Using the three versions

  • Start everyone with the same short explanation, then hand out Support, Core or Challenge.
  • Question numbers line up across the versions, so you can go through the answers with the whole class.
  • The PDF has a cover page and each version on its own pages; the answer keys PDF has all three keys.

See the original worksheet or browse more three-level worksheets.