## Friday, May 4, 2012

### Form 1 Chapter 6 >>> Sources of Energy

Here is some important part in Chapter 6, students can have a review here^^
6.1   The Various Form and Sources of Energy
- Energy is defined as the ability to do work. Energy is measured in joules (j).
- Energy can be found in many forms :

a) Kinetic Energy
• Kinetic energy is the energy possessed by a moving object.
• The kinetuc energy of an object depends on ots mass and velocity.
 example of kinetic energy-running of leopard

b) Potential Energy
• Potential energy is the energy stored in a body due to its position (gravitational potential energy) or its physical condition (elastic potential energy).
• The gravitational potential energy of an object depends on : the mass of the object, the distance of the object from the Earth's surface, and the power of the gravitational pull on the object.
• A falling object gain kinetic energy but loses potential energy.
• Elastic potential energy exists in only elastic substances such as spring or a rubber.
 elastic potential energy

c) Heat Energy
• Heat energy is the energy that is stored in hot object.
• The heat energy of a body depends on its temperature and volume.
 Heat Energy

d) Light Energy
• Light energy is the energy produced by an object that emits light.
• Light energy can travel in a vacuum and in a straight line in the form of waves.
 example of light energy

e) Sound Energy
• Sound energy is the energy produced by a vibrating object.
• The vibrating air forms sound waves.
 example of sound energy-drum

f) Chemical energy
• Chemical energy is the energy stored in a chemical substance.
• When substance undergoes chemical reaction, chemical energy which is stored will be released and converted into other form of energy.
 example of electrical energy-battery

g) Electrical Energy
• Electrical energy is the energy produced by the flow of electric charges
 example of electrical energy

h) Nuclear Energy
• Nuclear energy is the energy stored in the nucleus of an atom.
• Also known as atomic energy.
 example of neclear energy-nuclear plant

i) Mechanical Energy
• Mechanical energy is produced when a machine or object change its position.
 example of mechanical energy-used in meter glass

j) Solar Energy
• Solar energy is produced during the process of nuclear fusion in the Sun's core.
• Almost all the energy currently available comes from the Sun.
 Solar energy comes from Sun

Sources of Energy
Types of energy source on Earth
• Fossil fuels
• Biomass fuel