This document discusses simple and complex machines. It defines simple machines as having one or few components, and provides examples like levers, hammers, scissors, screws, and pulleys. Complex machines are defined as having many elements, and examples given include bicycles, cars, computers, and mobile phones. The document then provides more details about specific simple machines like levers, inclined planes, pulleys, and wheels. It concludes with activities to classify machines as simple or complex, and match machine names to pictures.

1. COMPLEX AND
SIMPLE MACHINES
Natural Science
3rd of Primary

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
hammer

5. LEVERS

6. EXAMPLES OF LEVERS
SCISSORS NUTCRACKER NAIL CLIPPER
SEESAW
WHEEL BARROW
TONGS

7. INCLINED PLANE OR RAMP

8. PULLEY

9. WHEEL

10. 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)

11. ACTIVITIES
1. Classify these machines in simple or complex.
lever – car – computer – hammer – pulley – clock –
bicycle – ramp – wheel - telephone
SIMPLE COMPLEX

12. ACTIVITIES
2. Match the name with the picture
Inclined plane
Wheel
Pulley
Lever
Hammer
Screw

13. JOURNAL
■ Write and draw three examples simple and
three of complex machines