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Conservation of Energy — Free MYP2 Sciences Practice Questions
1QuestionClosed Systems and Energy AccountingConcept Practice
2 marks~3 minCriterion A
The diagram shows a pendulum at three positions: position 1 (top of swing), position 2 (midpoint), and position 3 (bottom). Label A shows kinetic energy at position 2. Label B shows gravitational potential energy (stored energy due to height) at position 1. Label C shows total energy at position 1.
a
Identify which label represents the total energy of the pendulum system. [1]
b
Explain why that label also represents the total energy at every other position during the swing. [1]
Solutions
2QuestionClosed Systems and Energy AccountingAssessment Practice
2 marks~3 minCriterion D
A student uses a 500 W immersion heater to heat 1 kg of water inside a thermos flask for 2 minutes. A thermos is designed as a closed system — one that does not exchange energy with its surroundings.
Describe one real-world consequence of assuming this thermos is a perfectly closed system. [2]
Describe one real-world consequence of assuming this thermos is a perfectly closed system. [2]
Solutions
3QuestionDesigning Simple Energy InvestigationsAssessment Practice
3 marks~5 minCriterion B
A student drops a rubber ball from different heights and measures the bounce height each time. The graph shows a straight line through the origin, but the bounce-height line always sits below the drop-height line.
a
Identify the relationship between drop height and bounce height. [1]
b
Explain why the bounce height is always less than the drop height. Use the idea of energy transfer in your answer. [1]
c
A ball is dropped from 80 cm and bounces to 60 cm. Compare the energy at the start of the drop with the energy at the top of the bounce, and suggest where the missing energy has gone. [1]
Solutions
4QuestionExplaining Why Energy is Never Lost Only TransferredAssessment Practice
4 marks~6 minCriterion C
A child swings on a playground swing. After a push, the swing gradually slows down and stops. A friend says, "The energy has been lost — it's all used up."
a
Explain why the friend's claim is inaccurate, referring to the conservation of energy. [2]
b
Identify one reason why the energy transferred away from the swing cannot easily be recovered. [2]
Solutions
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