viernes, 27 de mayo de 2016

COMPLEX MACHINES

Complex machines

A complex machine is a machine that is made up of many operating parts.

Cars and bicycles are examples of complex machines.

A bicycle has wheels and axles that move the bike along. The handlebars, handbrakes and brake pedals are all types of levers. Many bikes also have gears that allow the rider to change the turning force. You can change the gears to make it easier to ride a bike up an inclined plane. The pedals need to be turned more but it is easier to travel uphill.

SIMPLE MACHINES:VIDEOS

Watch these videos about simple machines:

SIMPLE MACHINES

All About Simple Machines: Types and Functions

Every day you use machines without even thinking about it. A machine is anything that helps make work easier. Basic tools like staplers, screwdrivers and scissors are simple machines. These machines are all based on simple inventions like levers, planes, pulleys or wheels.

Various Simple Machines Image - Science for Kids All About Simple Machines

All About Simple Machines: These are samples of simple machines.

Fun Facts about Simple Machines for Kids

A lever is a stiff board or bar that rests on a base called a fulcrum. The fulcrum lifts and moves objects. Scissors, pliers, rakes and staplers are all types of levers.
A pulley has a rope and wheels. It can be used to pull things up. An old-fashioned well uses a pulley to pull water from underground.
A wedge has a pointed end. It can be driven into something to separate it. An axe is a wedge. So is a nail.
A wheel and an axle is a type of simple machine. A wheel has a rod, or axle, running through it. Your bicycle wheel has a wheel and axle.
An inclined plane has a slope that takes you from a lower surface to a higher one. A sloped sidewalk is an inclined plane. A dump truck and a roller coaster also have inclined planes.
A screw is an inclined plane wrapped around a rod. It holds things together securely.

¿QUÉ ES LA ENERGÍA?

LA ENERGÍA Y SUS TRANSFORMACIONES

LA ENERGÍA

TIPOS DE ENERGÍA: MIRA Y APRENDE

martes, 10 de mayo de 2016

MATERIALS

TYPES OF MATERIALS:

Metals

They are strong, hard and shiny materials that can be hammered into different shapes without breaking.

Many metals are good conductors of heat and electricity.

Some metals are magnetic. Iron is the most magnetic metal. Steel is also magnetic because it is made of mostly iron.

Their properties make them useful for objects such as cutlery, saucepans, cars and coins.

Plastics

Plastics are man made materials and they are not found in nature. They are strong and waterproof, and can be made into any shape by applying heat. Illustration of an action figure

Plastic is not magnetic. It is a good electrical insulator as it does not conduct heat or electricity.

Plastics are used to make all sorts of things, such as bags, bottles and toys.

Glass

Glass is made by melting sand and other minerals together at very high temperatures. Illustration of a window and a pair of spectacles

Glass is normally transparent and can be made into many different shapes. Thick glass can be strong, but thin glass will break very easily.

Glass is used for objects that need to be transparent such as windows and spectacles.

Wood

Wood comes from trees. Illustration of a wooden chair and a door

It is strong, flexible and long lasting.

Wood is used to make things such as furniture that need to be strong and last a long time.

Wood is an insulator of heat and electricity.

PROPERTIES OF MATERIALS

Materials have different properties that make them useful for different jobs. Here are some properties that materials have.

Transparent materials do let light through (you can see through them). Opaque materials do not let any light through (you cannot see through them).

Waterproof

Waterproof materials do not let water through and do not soak up water.

Absorbant

Absorbent materials soak up water and let water pass through them.

Strong or weak

Strong materials are very difficult to break. Weak materials break easily.

Flexible

Flexible materials are easy to bend.

Rigid

Rigid materials are difficult to bend.

Hard

Hard materials are difficult to scratch.

Conductors

Some materials are good conductors of heat. This means heat can travel through them easily.
Some materials are good conductors of electricity. This means electricity can travel through them easily.

Insulators

Some materials are insulators of heat. This means they do not allow heat to travel through them very easily. Some materials are insulators of electricity. This means that electricity cannot travel through them.