Energy Introduction         (Worksheet 1)

Humans need energy in order to perform various functions. These functions can be anything from walking to the process of digestion. As humans, our source of energy comes from food. Food is a form of chemical energy. However there are many different forms of energy.
 

Other Energies

• HEAT or THERMAL Energy Hot objects are sources of heat energy. Examples are radiators or fires.

• LIGHT Energy The sun, light bulbs and lamps are all luminous objects. They give off light energy.

• SOUND Energy Vibrating objects give off sound energy. Examples include hi-fi systems and musical instruments.

• ELECTRICAL Energy Electrical energy is available every time a current flows.

• CHEMICAL Energy Chemical Energy comes in a variety of forms.
  Examples include food, petrol and batteries.

• KINETIC Energy This is the energy that an object has because it is moving. Examples include wind and flowing water.

• ELASTIC POTENTIAL Energy Objects such as springs or rubber bands that are stretched contain elastic potential energy.

• GRAVITATIONAL POTENTIAL Energy Objects in a high position, that have the ability to fall have gravitational potential energy. An example is a waterfall.

• NUCLEAR Energy Reactions that occur in the nucleus of an atom are the source of Nuclear Energy.

• STORED Energy Several of the other energies mentioned are forms of stored energy. Stored Energy is where the energy is waiting to be used. Energies such as chemical energy, elastic potential energy and gravitational potential energy are all stored energies. Examples include the food within the human body through chemical energy.