Quick questions on Work, energy and power: conservation, kinetic and potential energy, efficiency - OCR A-Level Physics A

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 work done?

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The area under a force-displacement graph also gives the work done, which is useful when the force varies, for example stretching a spring.

What is q1?

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State the principle of conservation of energy. [1 mark]

What is q2?

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1200\ \text{kg}

car accelerates from rest to

15\ \text{m s}^{-1}

. Find the gain in kinetic energy. [2 marks]

What is q3?

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A pump does

6.0\ \text{kJ}

of useful work in

8.0\ \text{s}

from an input of

1.0\ \text{kW}

. Find the efficiency. [2 marks]

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