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Science

Energy Transfer and Conservation

Overview

Students trace energy transfers through real systems, discovering that energy changes form but is never created or destroyed.

Learning Objective
Students understand the different forms of energy, how energy transfers between forms, and the principle of conservation of energy.

Resources needed

  • A pendulum (stone on a string)
  • A ramp and ball

Lesson stages

0 / 7 done
  1. 1 Hold the pendulum to one side — ask: what type of energy does it have? (Gravitational potential energy).
  2. 2 Release it — as it swings down, potential energy converts to kinetic energy.
  3. 3 At the bottom: maximum kinetic energy. At the other side: potential again. Ask: why does it eventually stop?
  4. 4 Introduce energy dissipation: energy transfers to heat via air resistance and friction — it is not lost, just spread out.
  5. 5 State the law: energy cannot be created or destroyed — only transferred between forms.
  6. 6 Apply to a light bulb: electrical energy gives light energy + heat energy (heat is wasted energy).
  7. 7 Ask: what energy transfers happen when you eat food, digest it, and then run?

Tap a step to mark it as done.

Variations

  • Build a simple marble run — trace energy transfers at each stage.
  • Calculate efficiency: if a bulb uses 100 J of electrical energy and produces 10 J of light, what is the efficiency?
  • Discuss renewable energy: how does a solar panel, wind turbine, or hydroelectric dam transfer energy?
More information

Teach: kinetic, potential, thermal, electrical, chemical, transfer, conserve, dissipate. Energy transfer diagrams show both useful and wasted energy — a powerful visual tool.

Focus on two energy types — kinetic and potential — and their transfer in the pendulum before introducing other forms.

Can students trace all energy transfers in a given system? Can they state the law of conservation of energy and explain what wasted energy means?

A stone on any string makes a pendulum. A ball and ramp from any flat surface demonstrate kinetic and potential energy.

Students often say energy is used up or destroyed. Energy is always conserved — it changes form and spreads out, but the total amount never changes.

Conservation of energy is one of the most fundamental laws in physics.

Activity details
Secondary Medium 25 minutes no prep Whole Class, Small Group Indoor & Outdoor
Topics
Energy Transfer Conservation Of Energy Energy Types