Sec 2 DT lesson slides on simple machines: Lever, Incline plane, screw, wheel and axle

1. Travelling Ball
LESSON FOUR: INTRODUCTION TO MECHANISMS

2. Lesson Objectives
At the end of the lesson, students are able to :
1. Understand what mechanisms are how they are useful in everyday life
2. Understand what simple machines are and identify the different types of simple machines:
Lever
Inclined plane
Screw
Wheel and axle
Wedge
Pulley

3. What are mechanisms?
1. Mechanisms help to move and control things.
2. Mechanisms are sometimes called mechanical systems.
3. A mechanical system is used to change one kind of movement into another.
4. A mechanical system has an INPUT, a PROCESS and an OUTPUT.

4. 4 types of motion in mechanisms
https://www.youtube.com/watch?v=OfOQKv1mjks

5. What motion is involved?
Linear motion

6. What motion is involved?
Rotary motion

7. What motion is involved?
Reciprocating motion

8. What motion is involved?
Oscillating motion

9. Simple Machines
1. Simplest forms of mechanisms are known as simple machines
2. Simple machines are machines that ease our work.
3. Simple machines can be categorised into six types:
-Lever
-Inclined plane
-Screw
-Wheel and axle
-Wedge
-Pulley

10. Simple machines: Lever
https://www.youtube.com/watch?v=lueqE0lxLyc

11. Lesson checkpoint
1. What are levers?
2. What are the different types of levers?
3. Give examples of each type of lever.

12. Lesson activity
Refer to journal on page 7.

13. Simple machines: Inclined plane
https://www.youtube.com/watch?v=E_ErI0QjNos

14. Lesson activity
Refer to journal on page 8.

15. Simple machines: Screw
https://www.youtube.com/watch?v=v1hjiOp6FEU&list=PLBvXI5A80dCnB61M_cz1J0lB4ziRb4CYa

16. Lesson activity
Refer to journal on page 9.

17. Simple machines: Wheel and axle
https://www.youtube.com/watch?v=P7xu9O0miEc

18. Lesson activity
Refer to journal on page 10.

19. Lesson checkpoint
1. What are mechanisms?
2. Name the different types of motion.
3. What are simple machines?
4. Name some examples of simple machines.