JSS2 Basic Science Lesson Note on Principle of Conservation of Energy

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TOPIC: WORK, ENERGY, AND POWER

Content: Energy transfer when work is done

Principle Of Conservation Of Energy

It states: Energy cannot be created nor destroyed but can be converted from one form to another.

FORMS OF ENERGY

1. Mechanical energy
2. Light energy
3. Sound energy
4. Electrical energy
5. Heat energy
6. Nuclear energy
7. Magnetic energy
8. Chemical energy
9. Solar energy

These forms of energy are very useful to us in our daily activities. We derive comfort or pleasure from electrical, sound energy and chemical energy produced from the oxidation of food in our body tissues and it is utilized in doing work. As the watch ticks working by moving the hands, the stored energy called potential energy has been converted to kinetic energy. The chemical energy in petrol is converted into heat in the engine, which makes the car moves.

Torch light store chemical energy which is converted to electrical energy, then to heat and light which provides us light to see at night.

In riding a bicycle, the rider provides chemical energy which changes to mechanical energy as the. rider pedals the bicycle and the pedaling gives rise to a forward movement (kinetic energy) therefore work has taken place.

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