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QLDPhysicsQuick questions

Unit 2: Linear motion and waves

Quick questions on Work, kinetic and gravitational potential energy, conservation (QCE Physics Unit 2)

3short 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 q1?
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Define work and state the conditions for positive, negative and zero work. [2 marks]
What is q2?
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A 1000 kg1000 \text{ kg} car climbs from rest to 20 m s−120 \text{ m s}^{-1} while rising 5.0 m5.0 \text{ m}. Calculate the change in mechanical energy. [3 marks]
What is q3?
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A Cairns light-rail tram (45000 kg45000 \text{ kg}) at 14 m s−114 \text{ m s}^{-1} brakes regeneratively to rest. (a) Calculate the initial kinetic energy. (b) If recovery efficiency is 6060 per cent, determine the energy returned to the supply and dissipated.

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