Simple Machine (Pulleys) – Meaning and Types of Pulley | Applications of Pulleys Primary 6 (Basic 6) Term 3 Week 3 Basic Technology
BASIC SCIENCE AND TECHNOLOGY
THEME – YOU AND ENERGY
PREVIOUS LESSON – Simple Machines (Lever) – Meaning and Parts of Lever | The Uses of Levers Primary 6 (Basic 6) Term 3 Week 2 Basic Technology
TOPIC – SIMPLE MACHINE (PULLEY)
2. Meaning and Types of Pulleys
3. Examples and Applications of Pulleys
4. Lesson Evaluation and Weekly Assessment (Test)
By the end of the lesson, most of the pupils should have attained the following objectives –
1. recognize and identify simple pulley machines;
2. identify and describe the different uses of pulley machines in everyday life;
3. distinguish between fixed and movable pulleys;
4. make and use pulley machines to do work.
The pupils can identify and state the uses of crane.
The teacher will teach the lesson with the aid of:
2. Metal/wooden/plastic rollers
5. Charts showing uses of simple pulleys
6. Simple pulleys
METHOD OF TEACHING
Choose a suitable and appropriate methods for the lessons.
Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.
1. Scheme of Work
2. 9 – Years Basic Education Curriculum
3. Course Book
4. All Relevant Material
5. Online Information
Relevant link – Simple Machines – Meaning, Types and Applications of Pulleys – ASEI PDSI METHOD (Primary 6)
CONTENT OF THE LESSON
LESSON 1 – INTRODUCTION
A pulley is a wheel that has a smooth groove in its rim, with a rope passing through the groove. At times, there are loads that are too heavy to lift.
A pulley is a simple machine that is used to lift heavy objects.
A simple machine for overcoming this difficulty is the pulley.
EXAMPLES OF PULLEY MACHINES
The examples of pulley machines are as follows:
1. Flag pole
2. A sewing machine
3. Photocopy machine
4. Spring balance
5. A grinder machine
6. A modern elevator
7. A crane
LESSON 2 – TYPES OF PULLEYS
Basically, there are two (2) types of pulleys:
1. Single fixed pulley
2. Movable pulley
3. Compound pulley
1. SINGLE FIXED PULLEY
A fixed pulley’s wheel and axle stay in one place.
A good example of a fixed pulley is a flag pole.
When you pull down on the rope, the direction of force is redirected by the pulley, and you raise the flag pole.
2. MOVABLE PULLEY
A movable pulley is a pulley that is free to move up and down, and is attached to a ceiling or other object by two lengths of the same rope.
Examples of movable pulleys include construction cranes, modern elevators, and some types of weight lifting machines at the gym.
3. COMPOUND PULLEY
A compound pulley is a combination of fixed and movable pulleys. The third type of pulley is the compound pulley, which consists of combinations of fixed and movable pulleys.
The more complex the pulley, the more the effort needed to move the object decreases.
LESSON 3 – COMMON APPLICATIONS (USES) OF PULLEY
The common applications of pulley are as follows:
1. It is used for lifting heavy objects.
2. It is used in grinder and sowing machines.
3. It is used in an elevator.
4. It is used in raising a flag.
5. It is used for loading and off loading cargos.
6. It used for drawing curtains.
7. It is used ladder extensions.
8. It is used for climbing rock or mountain.
SIMPLE CONSTRUCTION OF FIXED AND MOVABLE PULLEYS (25 MINUTES)
The teacher organizes the pupils in groups or pairs depending on the size of the class to construct simple fixed and movable pulley using wooden materials.
To deliver the lesson, the teacher adopts the following steps:
1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions.
2. Teacher organizes the pupils in groups or pairs depending on the size of the class.
3. Teacher displays chart showing different simple machines.
4. Teacher lets pupils name and state the uses of each simple machine (pulley).
5. Teacher uses the chart and pupil’s responses to introduce the lesson and leads a discussion on the meaning and types of pulley.
6. Teacher uses the chart in activity 3 and pupil’s responses in activity 4 to guide pupils to state the uses of pulley machine.
7. Teacher provides soft wood for each of the group or pair, guides them to construct and demonstrate the uses of fixed and movable pulley machines.
8. Teacher takes the class on visits to places where they can observe the application of pulleys. Note, safety first.
9. Teacher summarizes each of the lesson on the board with appropriate lesson introduction.
Pupil’s Activities – Participate actively in the summary of the lesson by responding correctly to the questions and write as instructed.
- To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson (Simple Machines – Inclined plane).
- Next Lesson – Simple Machine (Inclined Plane) – Meaning and Advantages of Inclined Plane Primary 6 (Basic 6) Term 3 Week 4 Basic Science
Teacher asks pupils to,
1. give 5 examples of simple pulleys;
2. state 5 applications of pulley machines;
3. differentiate between fixed and movable pulleys;
4. construct and demonstrate the uses of pulleys