This document discusses energy, tools, machines, and how they have changed over time. It explains that machines make work easier and are either simple machines like levers, wheels, and screws or complex machines that combine two or more simple machines. Simple machines include the lever, wheel, screw, wedge, and inclined plane. Complex machines mentioned are the wheelbarrow, crane, escalator, and scissors. The document also discusses how computers are machines that allow us to work, listen to music, and play games when connected to the internet. It provides examples of how tractors and washing machines have replaced horses and washing by hand. Finally, it outlines different types of energy like human, electrical, solar, and wind energy that
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Energy, tools and machines
1. UNIT 2: ENERGY, TOOLS AND
MACHINES
NATURAL
SCIENCE
SECOND LEVEL
PRIMARY
CEIP SANTA ANA
MADRIDEJOS
(TOLEDO)
M捉 Isabel
L坦pez
7. COMPUTERS
Computers are machines. We use computers to do work, to listen to
music and to play games. When a computer is connected to the
Internet, we can look for information and communicate with people by
email.
PRINTER
KEYBOARD
MONITOR
CPU
SPEAKERS
MOUSE
8. THEN AND NOW
In the past, horses
pulled ploughs.
In the past, people
washed their clothes
in rivers.
Today, tractors
pull ploughs.
Today, people wash
their clothes in
washing machines.
IN THE
PAST
TODAY
9. All tools and machines need energy
to move.
Energy is ability to do some work.
Energy can be stored.
There are different types of energy.
ENERGY
10. TYPES OF ENERGY
HYDEL ENERGY
SOLAR ENERGY HEAT ENERGYWIND ENERGY
HUMAN ENERGY
ELECTRICAL
ENERGY
11. ELECTRICITY AND HUMAN ENERGY
Many of the machines that we use every day work with
electricity
REFRIGERATO
R
TV
FAN
WASHING
MACHINE
DRILL
COMPUTE
R
12. Some machines, for example bicycles, work with
human energy
PENCIL
SHARPENE
R
TIN-
OPENER
RAZOR
SQUEEZER
BICYCLE
SCISSORS