Learning objective
A.3.1—Conservation of energy
• Principle of the conservation of energy.
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Course review
A.3 Work, energy and power
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Learning objective
A.3.2—Work as energy transfer
• Work done by a force is equivalent to a transfer of energy.
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Learning objective
A.3.3—Sankey diagrams
• Energy transfers can be represented on a Sankey diagram.
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Learning objective
A.3.4—Work by constant force
• Work by constant force along displacement: W = Fs cos θ.
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Learning objective
A.3.5—Work-energy change
• Work done by the resultant force on a system is equal to the change in the energy of the system.
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Learning objective
A.3.6—Mechanical energy
• Mechanical energy includes kinetic, gravitational potential and elastic potential energy.
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Learning objective
A.3.7—Mechanical energy conservation
• Mechanical energy is conserved when friction/resistive forces are absent.
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Learning objective
A.3.8—Mechanical energy transformations
• If mechanical energy is conserved, work transforms energy between mechanical forms. • Relevant forms: translational kinetic, near-Earth gravitational potential and elastic potential.
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Learning objective
A.3.9—Kinetic energy
• Translational kinetic energy: Ek = 1/2mv^2 = p^2/2m.
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Learning objective
A.3.10—Gravitational potential energy
• Near Earth, gravitational potential energy change: ΔEp = mgΔh.
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Learning objective
A.3.11—Elastic potential energy
• Elastic potential energy: EH = 1/2k(Δx)^2.
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Learning objective
A.3.12—Power
• Power is rate of work or energy transfer: P=ΔW/Δt=Fv.
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Learning objective
A.3.13—Efficiency
• Efficiency: η=Eoutput/Einput=Poutput/Pinput.
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Learning objective
A.3.14—Fuel energy density
• Energy density of the fuel sources.
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