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Mechanics and materials
Quick questions on Work, energy and power: conservation and efficiency - Edexcel A-Level 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 conservation of energy?Show answer
This principle lets you solve problems without tracking forces: equate the total energy at the start and end, accounting for any work done against resistive forces.
What is q1?Show answer
State the principle of conservation of energy. [1 mark]
What is q2?Show answer
A kg object moves at m per second. Find its kinetic energy. [2 marks]
What is q3?Show answer
A motor takes in W and delivers W of useful power. Find its efficiency. [2 marks]
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