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SingaporeCombined ScienceQuick questions
Physics: Measurement, Forces and Energy
Quick questions on Energy, work and power explained: O-Level Combined Science
5short 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 conservation of energy?Show answer
The principle of conservation of energy states that energy cannot be created or destroyed, only transferred from one store to another or one form to another. The total amount of energy stays the same. The unit of energy is the joule ().
What is work done?Show answer
Work is done when a force moves its point of application through a distance in the direction of the force:
What is q1?Show answer
State the principle of conservation of energy. [2 marks]
What is q2?Show answer
A object moves at . Calculate its kinetic energy. [2 marks]
What is q3?Show answer
Explain why a machine can never be 100% efficient. [2 marks]
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