2. Energy
• Energy is the ability to do work,or the ability to move or elicit change
in matter.
• Energy has a few important properties. Energy is always ‘’
conserved’’-it cannot be created or destroyed.
3. Where does energy come from?
• Energy come from different sources such as oil, coal, wind, the sun,
water, natural gas and even manure, but most of our energy comes
originally from the sun.
4. Types of energy
• The two main types of energy:
Potential energy
Kinetic energy
6. • Light or radiant energy:
Is the energy transmitted by electromagnetic radiation. Light is one
type of electromagnetic radiation. Some other kinds of electromagnetic
radiation include X-rays, radio waves, and microwaves. Radiant energy
travels in waves.
7. Heat or termal energy:
Matter is made up of particles or molecules. These molecules move (or
vibrate) constantly. A rise in the temperature of matter makes the
particles vibrate faster. Thermal energy is what we call energy that
comes from the temperature of matter.
8. • Electrical energy:
is generated by the movement of electrons. Electricity creates
motion, light or heat.
Sound is produced when a force causes an object or substance
to vibrate — the energy is transferred through the substance in
a wave.
10. Examples of potential energy are:
• Mechanical energy:
Is the energy possessed by an object due to its motion or its position.
• Chemical energy:
Comes from atoms and molecules and how they interact.
• Nuclear energy:
Huge amounts of nuclear energy can be generated by splintting atoms.
• Gravitational energy: is the motion that is caused by gravity. Large
objects such as the Earth and the Sun create gravity.
