NATURAL SCIENCE: SIMPLE AND COMPLEX MACHINES

Hello kids!

Today is also time for Natural Science and we begin our last unit: Machines and Inventions.

We all know that there are machines all around us. We have machines at home, at school, in the street, even in your pencil case there are machines.

Let's learn about them!

Machines are here to make our lives easier because they are here to make our work easier.

There are two types of machines:

1. SIMPLE MACHINES that only have 1 or 2 parts and we call them tools. Examples: a knife to cut, a pencil sharpener, a pair of scissors or a screwdriver.

2. COMPLEX MACHINES have more than 2 parts and many times they are a combination of different machines. Examples: a bicycle, a washing machine, a hair drier or a computer.

All machines need energy to work. 

Some need our own energy, for example a pencilsharpener. Some others need fuel to move, for example a car. Other machines need electricity, for example a TV set. And finally some machines need the energy of the sun, the wind or the water to work. These are really cool because they don't pollute the air, for example a windmill. 

I'd like you to watch this video to see more examples and learn more. Hope you like it.

The next video is only about simple machines but it's a song and I know that some of you love singing so here you are.

In your Natural Science book I want you to read pages 96 and 97 and do exercise 3. It's really easy!!!