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UNIT 2: ENERGY, TOOLS AND
MACHINES
NATURAL
SCIENCE
SECOND LEVEL
PRIMARY
CEIP SANTA ANA
MADRIDEJOS
(TOLEDO)
M捉 Isabel
L坦pez
MACHINES
Machines are instruments which make our
work easier. There are simple machines and
complex machines.
LEVER
WHEEL
SCREW
SIMPLE MACHINES: It卒s a
basic tool that is used to do work.
WEDGE
INCLINED
PLANE
PULLEY
COMPLEX MACHINES: Two or
more simple machines working
together.
WHEELBARROW CRANE
WHEEL
LEVER
WHEEL
LEVER
PULLEY
ESCALATOR
SCISSORS
INCLINED PLANE
PULLEYS
(inside)
WEDGES
LEVERS
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
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
 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
TYPES OF ENERGY
HYDEL ENERGY
SOLAR ENERGY HEAT ENERGYWIND ENERGY
HUMAN ENERGY
ELECTRICAL
ENERGY
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
Some machines, for example bicycles, work with
human energy
PENCIL
SHARPENE
R
TIN-
OPENER
RAZOR
SQUEEZER
BICYCLE
SCISSORS
LIGHT
NATURAL LIGHT ARTIFICIAL LIGHT
THE SUN
THE MOON
A CANDLE A TORCH
A FIRE A LAMP
ENERGY, TOOLS
AND MACHINES

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