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Science · Grade 11

Work, Energy and Conservation

Learners define work as energy transferred by a force (W = Fd cos θ) and connect it to kinetic energy through the work–energy theorem. They calculate kinetic, gravitational and elastic potential energy, apply conservation of energy with and without friction (including a ramp simulation whose limits are stated), and finish with power and efficiency, tracking where energy goes in real machines.

  • 5 lessons
  • About 125 minutes
  • Work, energy and power check: 10 questions
  • Ways to answer: choose an answer, estimate, draw a graph, match pairs, type a number and put in order
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What learners will discover

  • Calculate the work done by a force with W = Fd cos θ, identify positive, negative and zero work, and use the work–energy theorem (W~net~ = ΔKE).
  • Calculate kinetic energy, changes in gravitational potential energy and elastic potential energy, and use Hooke's law and the area under a force–extension graph.
  • Apply conservation of energy to systems with and without friction, accounting for the energy transferred to thermal energy by resistive forces.
  • Calculate power (P = W/t = Fv) and efficiency, and interpret data on the useful and wasted energy transfers of a device.

Lessons

  1. Work: energy transferred by a force 9 steps5 practiceabout 24 min
  2. Energy stores: kinetic, gravitational and elastic 9 steps6 practiceabout 24 min
  3. Conservation of mechanical energy 8 steps5 practiceabout 24 min
  4. Friction, thermal energy and a ramp model 8 steps5 practiceabout 26 min
  5. Power and efficiency 8 steps5 practiceabout 22 min
  6. Work, energy and power check 10 questions at the end

Keep exploring

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Guide for grown-ups