Energy Systems, Efficiency, and Evidence Worksheet
📝 Worksheet hard ⏱️ 22 minutes 10 problems
Energy Systems, Efficiency, and Evidence Worksheet
Grade 8 Science LearnCrux.com
Name:
Date:
Directions
- Fill in each blank carefully.
- Circle or mark the best answer for each multiple-choice question.
- Match each prompt to the best option before writing your answer.
- Use the larger space to show your thinking on word problems.
1. Scientists begin energy analysis by identifying the __ being studied.
2. Which design goal focuses on reducing thermal energy transfer?
3. Match the design goal to the best strategy: keep a cold pack cold longer
Match with:
Answer:
4. Work happens when a force moves an object through a __.
5. Why should students compare data from more than one test when judging an energy design?
6. Which example shows potential energy changing into kinetic energy?
7. Match the energy change to the likely output: a machine gets hot while running
Match with:
Answer:
8. In a useful model, students track where energy enters, leaves, or __ within the system.
9. Which claim is best supported by test evidence?
10. Why do energy design problems usually involve tradeoffs instead of one perfect solution?
📋 Teacher Answer Key
1. system
2. keeping soup warm in a lunch container
3. use better insulation around the pack
4. distance
5. Repeated evidence gives a more reliable picture of how well a design transfers or slows energy in the system.
6. a roller coaster dropping from a hill
7. some energy is transferred as thermal energy
8. changes
9. The foam design slowed temperature change the most during the trial.
10. A design may improve one energy goal while affecting cost, weight, safety, or other parts of system performance.