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VICPhysicsQuick questions

Unit 2: How does physics help us to understand the world?

Quick questions on Work, energy and power: VCE Physics Unit 2 Year 11

7short 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 gravitational PE?
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PEg=mghPE_g = mgh where hh is height above a reference point. The reference is arbitrary; only changes in PEPE matter.
What is elastic PE?
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A spring with spring constant kk stretched or compressed by xx from equilibrium: PEe=12kx2PE_e = \frac{1}{2} k x^2.
What is power = work/time, not force?
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Power is the rate at which work is done.
What are friction in conservation problems?
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When friction is present, mechanical energy is not conserved; account for the energy loss separately.
What is q1?
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Define work and state the unit of mechanical power. [2 marks]
What is q2?
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A 10001000 kg car accelerates from rest to 2020 m s−1^{-1} over 8080 m. Calculate (a) the kinetic energy gained, and (b) the average power delivered if it takes 8.08.0 s. [4 marks]
What is q3?
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Refer to Snowy 2.0. (a) Calculate the energy required to lift 11 kg of water 700700 m. (b) Determine the round-trip efficiency given turbine and pump efficiencies of 80%80\% each.

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