Mini PhysicsPart of Mini Education

Interactive practice

Work, Energy & Efficiency Explorer

Choose the right equation, compare energy changes, and track useful output versus losses in one O Level explorer.

  • O Level
  • Explore first
  • 11 min
BetaReviewed Mar 2026Back to O Level Essentials

Focus: Pick the energy story first, then decide whether the question is asking for energy, rate, or efficiency.

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Interactive stageLive model

Study lensChoose between work done, kinetic energy, GPE, power, and efficiency equations from the scenario shown.11 min activity

Try this

Pick the energy story first, then decide whether the question is asking for energy, rate, or efficiency.

Learn to

  • Choose between work done, kinetic energy, GPE, power, and efficiency equations from the scenario shown.
  • Compare energy-store changes and explain where useful output and wasted energy go.
  • Handle short O Level calculations without mixing force with energy or power with energy.

Exam transfer

  • Energy methods
  • Calculation + explanation

Governing idea

W = Fs cos θ, Eₖ = ½mv², gravitational energy change = mgΔh, P = E/t, and efficiency = useful output ÷ total input.

Model boundary

Only displayed energy stores and losses are included. Real systems may also transfer energy through sound, deformation, air resistance, and heating elsewhere.

Avoid this trap

Efficiency is a ratio of like quantities and cannot exceed 100%. Keep joules with joules, or watts with watts.

Practice run

Choose a mode and checkpoint count when you want scoring.

Try Work, Energy & Power Quiz

Choose your checkpoint count for guided or challenge mode.

Scenario setup

Core mode
12 kg
180 N
3.0 m
6.0 m s⁻¹
4.0 m
Rate and transfer controls
More controls
8 s
1200 J
720 J

Energy checkpoint

What to notice:

Prediction target:

      What you'll train

      Learning objectives

      • Choose between work done, kinetic energy, GPE, power, and efficiency equations from the scenario shown.
      • Compare energy-store changes and explain where useful output and wasted energy go.
      • Handle short O Level calculations without mixing force with energy or power with energy.

      Use this when

      • O Level work-energy-power revision
      • Students who know formulas but still hesitate over which one fits the question
      Related lessons
      Next practice

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