Track stores and transfers
See this course’s project requirements
An energy-accounting notebook explaining work, stored energy, efficiency and three heat-transfer mechanisms in supplied desk scenarios.
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What to include
- Account for useful and dispersed stores within a boundary.
- Calculate work with constant parallel force conditions.
- Calculate gravitational energy change using supplied g and height differences.
- Compare efficiencies with the same useful-output definition.
- Classify three heat-transfer routes.
- Compare supplied thermal designs with limits and complete all changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Fictional rolling object begins with 100 J of kinetic energy. Supplied final ledger:40 J remains in motion; 60 J increases thermal energy of the object and surface. No other transfer is included. The paper model does not require rolling an object.
Energy is accounted for in a defined system and its surroundings. Motion, gravitational position and internal thermal energy are useful stores in this course; work and heating describe transfers. A process can reduce a useful store while increasing a thermal store. That is dispersion, not destruction of energy.
Track stores and transfers — worked practice
Energy is accounted for in a defined system and its surroundings. Motion, gravitational position and internal thermal energy are useful stores in this course; work and heating describe transfers. A process can reduce a useful store while increasing a thermal store. That is dispersion, not destruction of energy.
Fictional rolling object begins with 100 J of kinetic energy. Supplied final ledger:40 J remains in motion; 60 J increases thermal energy of the object and surface. No other transfer is included. The paper model does not require rolling an object.
1. 1. Boundary
Name the included system and surroundings.
You should see: Object and contacted surface are included in the accounting.
2. 2. Stores
List initial and final stores separately.
You should see: Initial motion 100 J; final motion 40 J and thermal increase 60 J.
3. 3. Balance
Add final contributions and compare with input.
You should see: 40+60=100 J.
4. 4. Explain
Correct “friction destroyed 60 J.”
You should see: The modeled energy dispersed into thermal stores; it is less available as organized motion but remains accounted for.
What to finish
An initial/final energy ledger with a corrected friction explanation.
Watch for this
A boundary determines whether energy remains in a listed store or crosses to surroundings. An unclear boundary can make a correct transfer appear missing.
How can I tell I understand it?
Balance a changed final ledger while explaining where useful energy went.
Quick knowledge check
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
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