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SingaporeCombined ScienceQuick questions
Physics: Measurement, Forces and Energy
Quick questions on Work, energy and power: N(A)-Level Combined Science Physics
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is stores of energy?Show answer
Energy can be stored in several ways, including:
What is conservation of energy?Show answer
The principle of conservation of energy says energy cannot be created or destroyed, only transferred from one store to another or moved from place to place. The total energy always stays the same. Some energy is usually transferred to the surroundings as wasted thermal energy, which is why no machine is perfectly efficient.
What is work done?Show answer
Work is done when a force moves something through a distance:
What is power?Show answer
Power is the rate of transferring energy, or how much energy is transferred each second:
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