This document discusses simple and complex machines. Simple machines have one or few components and examples include levers, hammers, scissors, screws, and pulleys. Complex machines have many elements, such as bicycles, cars, computers, mobile phones, and clocks. The document asks students to classify machines as simple or complex, identify parts of levers, and provide examples of simple and complex machines.

1. COMPLEX AND SIMPLE MACHINES
N A T U R A L S C I E N C E
3 R D O F P R I M A R Y

2. SIMPLE MACHINE
A simple machine has one or few components
Example: lever, hammer, scissors, screw, pulley, ramp

3. COMPLEX MACHINES
A complex machine has a lot of elements
Example: bicycle, car, computer, mobile phone, clock

4. SIMPLE MACHINES

5. LEVERS

6. COMPLEX MACHINES

7. 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)

8. ACTIVITIES
1. Classify these machines in simple or complex.
1. Write load, fulcrum or effort in this levers
lever – car – computer – hammer – pulley – clock –
bicycle – ramp – wheel - telephone

9. JOURNAL
Write and draw three examples simple and three of complex machines