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Conservation of Energy — Free MYP3 Sciences Practice Questions
1QuestionClosed Systems and Energy AccountingConcept Practice
2 marks~3 minCriterion A
A sealed flask is completely filled with water. A heating coil and a thermometer are inserted through the stopper. No water or air can enter or leave the flask. When the heating coil is switched on, the thermometer reading rises.
Identify the energy store that increases in the water as the temperature rises, and state where in the system this energy is stored. [2]
Identify the energy store that increases in the water as the temperature rises, and state where in the system this energy is stored. [2]
Solutions
2QuestionClosed Systems and Energy AccountingAssessment Practice
3 marks~5 minCriterion C
A student uses a small solar panel to charge a phone battery. The solar panel receives 500 J of solar energy. The battery stores 180 J as electrical energy. The remaining energy is transferred to the surroundings as heat.
a
Calculate the energy transferred to the surroundings as heat. [1]
b
Explain one reason why the actual heat lost to the surroundings may differ from your answer in part (a). [1]
c
The student claims this solar charger is "about 35% efficient." Justify whether this claim is correct, using your answer from part (a). [1]
Solutions
3QuestionClosed Systems and Energy AccountingConcept Practice
3 marks~5 minCriterion B
A pendulum, a bouncing ball, a skateboard on a ramp, and a mass on a spring are each treated as a closed system. The table below shows energy values recorded for each system.
System — Initial (J) — at lowest point (J) — Final (J)
System — Initial (J) — at lowest point (J) — Final (J)
| Pendulum | 10.0 | 10.0 | 10.0 |
|---|---|---|---|
| Bouncing ball | 8.0 | 8.0 | 8.0 |
| Skateboard ramp | 12.0 | 12.0 | 12.0 |
| Mass on spring | 6.0 | 6.0 | 6.0 |
a
State what you notice about the three energy values recorded for any one system. [1]
b
Explain what these values show about the total mechanical energy of a closed system. [1]
c
Describe the energy transformations that occur as the pendulum moves from its highest point to its lowest point and back to its highest point, and explain why the final equals the initial . [1]
Solutions
4QuestionDesigning Simple Energy InvestigationsAssessment Practice
5 marks~8 minCriterion D
A student builds a simple solar oven from a cardboard box lined with aluminium foil and covered with plastic wrap. She places 200 mL of water at an initial temperature of inside the oven and records the temperature every 5 minutes for 30 minutes on a sunny day.
a
Identify and explain two limitations of this solar oven as a model for a real solar cooker. [3]
b
Propose one modification to reduce heat loss and explain how it would make the model more representative of a real solar cooker. [2]
Solutions
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