Nuclear power station

Nuclear energy in radioactive elements --> Heat --> Kinetic energy of steam --> Kinetic energy of turbines --> Electricity

Hydroelectric dams

Gravitational potential energy of water--> Kinetic energy of the water --> Kinetic energy of turbine --> Electrical energy

Energy

Energy is the ability to do work

Potential Energy

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

Chemical potential energy

• the energy stored in fuels such as petrol and food
• can be released through chemical reactions

Gravitational potential energy

• the energy an object has because of its position or location

Elastic potential energy

• the energy an object has when it is stretched or compressed

Kinetic energy

• the energy that a body has due to its motion

Heat energy

• the energy that flows from a region of higher temperature to one at lower temperature

Light energy

• the energy that enables us to see

Sound energy

• the energy produced when objects vibrate
• allows us to communicate

Electrical energy

• the energy that results from the flow of charged particles
• can be transformed into many other forms of energy

Biomass

Biomass, a renewable energy source, is biological material derived from living, or recently living organisms, such as wood, waste, (hydrogen) gas, and alcohol fuels. Biomass is commonly plant matter grown to generate electricity or produce heat. In this sense, living biomass can also be included, as plants can also generate electricity while still alive. The most conventional way on how biomass is used however, still relies on direct incineration. Forest residues for example (such as dead trees, branches and tree stumps), yard clippings, wood chips and garbage are often used herefore. However, biomass also includes plant or animal matter used for production of fibers or chemicals. Biomass may also include biodegradable wastes that can be burnt as fuel. It excludes organic materials such as fossil fuels which have been transformed by geological processes into substances such as coal or petroleum.

Source: Wikipedia

Summary

I learnt lots of things during this term's Physics lessons, like S.I. units, mass, weight, density, work done, moments and energy. I have also learnt about many interesting things such as why face blotters and stiletto heels are not good. I have also learnt from Mr Lim that the weakest part of the school with the least stability is the toilet. Through the video of the airplane, I have learnt about conserving energy and I think that it demonstrated the law of conservation of energy. I really enjoyed Physic lessons this term.

Levers

Levers

First class levers

The fulcrum is between the load and the effort.

Examples: seesaw, scissors, crowbar

Second class levers

The load is between the fulcrum and the effort.

Examples: wheelbarrow, nutcracker

Third class levers

The effort is between the fulcrum and the load.

Examples: fishing rod, broom

The principle of moments

The principle of moments

The principle of moments states:

When a body is in equilibrium, the sum of clockwise moments about a pivot is equal to the sum of anticlockwise moments about the same pivot.