An interesting video on sound

Sound

Sound is the energy produced when objects vibrate.

Sound...

• helps us communicate
• allows us to enjoy music
• use as a warning

Why do you think that glass can produce such a beautiful melody?

By touching the glass, we are making it vibrate, thus, sound is produced.

Generation of electricity

In a fuel power station what happens?

1. A fuel such as coal, oil or natural gas is burnt and heat is produced to boil the water in the boiler.

Chemical potential energy of the fuel-->Heat energy of the water

2. The heat energy turns water into steam at high pressure, which goes through the boiler and turns the turbines.

Potential energy and kinetic energy of steam-->kinetic energy of the turbines

3. The turbines are connected to a generator, which converts the kinetic energy of the turbine blades into electricity

kinetic energy of turbines-->Electricity

Electrical energy

electricity or electrical energy is the energy that results from the flow of charged particles

Electricity is a useful form of energy that can be transformed into many other forms of energy.

Learn more from this video:)

Light energy

Light enables us to see

things that are luminous can give out light energy. The sun is an important source of light energy in the day.

Why are we able to see objects like books even though they don't give off light?

This is because light from a light source, like the sun, reflects light off the and into our eyes.

Why do we feel cool when wearing white on a sunny day but feel hot when we wear black?

Have you ever wondered why roses are red and why violets are blue? This should give you the answers. Enjoy :)

Ever wondered how heat travels?

Watch this interesting clip!

heat energy

Heat is the energy that flows from a region of higher temperature to one at a lower temperature.

Work

Oops... sorry everyone. I should have posted this last time before moments.

Conditions for work to be done

1. There is a force acting on the object
2. The object moves
3. The movement of the object is in the direction of the force

kinetic energy

kinetic energy is the energy that a body has due to its motion. All moving objects have kinetic energy.

Example: A girl walking down the street

This video should tell you more! :)

potential energy

Potential energy is stored energy due to a body's position or condition.

This video demonstrates gravitational potential energy. Enjoy! :)

Gravitational potential energy

Gravitational potential energy is the energy an object has because of its position or location. The higher the object is from the ground, the more gravitational potential energy it has, thus, it has more potential to fall

Example: a chandelier hung on the ceiling possess gravitational potential energy

Chemical potential energy

Chemical potential energy is the energy stored in fuels such as petrol and food that can be released through chemical reactions.

Example: We need to eat food to store ourselves with chemical potential energy so that it can be transformed into other types of energy as we carry out different activities like running (converted into kinetic energy)

Elastic potential energy

Elastic potential energy is the energy an object has when it is stretched or compressed.

Example: a stretched rubber band possesses elastic potential energy

The three classes of levers

here are the 3 classes of levers!