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COMPLEX AND
SIMPLE
MACHINES
Natural Science 4th of Primary
SIMPLE MACHINE
 A simple machine has one or few components
Example: lever, hammer, scissors, screw,
pulley, ramp
COMPLEX MACHINES
 A complex machine has a lot of elements
Example: bicycle, car, computer, mobile phone,
clock
SIMPLE OR COMPLEX
MACHINES

SIMPLE MACHINES
LEVERS
COMPLEX MACHINES
QUESTIONS
 What kind of machine is a computer?
 What kind of machine is a hammer?
 What are the three parts of a lever?
 Let’s think in examples of simple machines
(Write 5 words)
 Let’s think in examples of complex machines
(Write 5 words)
ACTIVITIES
1. Classify these machines in simple or
complex.
2. Write load, fulcrum or effort in this levers
lever – car – computer – hammer – pulley – clock –
bicycle – ramp – wheel - telephone
JOURNAL
 Write and draw three examples simple and
three of complex machines

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Complex and simple machines