This document discusses simple and complex machines. Simple machines have one or few parts like levers, hammers, and pulleys. Complex machines have many elements, such as bicycles, cars, computers, and phones. It provides examples of simple machines like levers and complex machines. Students are asked questions to classify machines and identify lever parts. Activities involve classifying machines and labeling lever components. A journal entry asks students to write and draw examples.

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.
2. 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