Energy L1: Introduction to Energy Learning Objectives: Recall the different forms of energy. Understand the law of conservation of energy. Describe energy transfers.

Task Can you think of all the different forms of energy? Write down as many types of energy as you can think of – HINT: there are 9. It does not matter what their answers are. Correct definition is ‘the ability to do work’ but not something to tell any class except accelerated.

Types of energy Light Sound Thermal (heat) Electricity Chemical Elastic or Strain Kinetic (movement) Gravitational Potential Nuclear (from nucleus of atoms)

Which types are stored energy? Types of energy Light Sound Thermal (heat) Electricity Chemical Elastic or Strain Kinetic (movement) Gravitational Potential Nuclear Which types are stored energy?

Types of energy Fuels store chemical energy Light Sound Thermal (heat) Electricity Chemical Elastic or Strain Kinetic (movement) Gravitational Potential Nuclear Fuels store chemical energy Stretched objects store elastic energy. Gravitational potential energy is the energy stored in objects above the ground.

Energy changes Instructions: e.g. A book hitting the floor: For each demonstrated action describe: a) What happens b) Draw energy changes as in the example. e.g. A book hitting the floor: Kinetic energy Sound + thermal (heat). This can be a circus – student look at each energy change. I prefer to do a demonstration and students record. Demos: Circuit – battery and lamp, Adding weights to suspended spring, falling book, Lit bunsen burner, cereal bar, electric fan.

Electricity  Light + Thermal (Heat)

Gravitational Potential  Kinetic + Elastic + GP  Elastic (Strain) + Gravitational Potential

Gravitational  Kinetic  Sound + Thermal

Chemical  Light + Thermal (Heat)

Chemical  Kinetic + Thermal (Heat) + Sound

Electricity  Kinetic + Sound + Heat

Law of Conservation of Energy Energy cannot be created or destroyed, only change form. We say that energy is transferred from one type to another. This means that in an energy transfer, the amount of energy going in must be the same as the amount of energy coming out (only the type of energy is different).

100 J Electrical energy  70 J light energy + 30 J heat energy Energy Transfers Energy is measured in joules (J). Example: Light bulb 100 J Electrical energy  70 J light energy + 30 J heat energy

Video https://www.brainpop.com/science/energy/formsofenergy/