BASIC SCIENCE AND TECHNOLOGY
THEME – YOU AND ENERGY
PREVIOUS LESSON – Simple Machines – Meaning, Parts and Uses Levers (Primary 6)
TOPIC – PULLEYS
1. Pulleys (Meaning)
2. Examples of pulley
3. Types of pulley
4. Application of Pulleys
By the end of the lesson, the pupils should have attained the following objectives (cognitive, affective and psychomotor):
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 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 ONE – 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.
MEANING OF PULLEY
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
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 TWO – TYPES OF PULLEYS
Basically, there are two (2) types of pulleys:
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.
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.
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.
COMMON APPLICATIONS OF PULLEY As stated in examples.
Revision and summary of the lesson.
LESSON THREE – WEEKLY ASSIGNMENTS
As stated in performance objectives or lesson evaluation.
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. Guides and helps in the collection of simple pulley machines;
Pupils’ Activities – Collect simple pulley machines.
3. Guides pupils to identify the application of pulleys;
Pupils’ Activities – Identify the application of pulleys; Examine and observe pulleys at work.
4. Guides pupils to construct and use pulleys;
Pupils’ Activities – Construct simple pulleys.
5. Takes the class on visits to places where they can observe the application of pulleys;
Pupils’ Activities – Use pulleys to lift loads.
- 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).
1. Give three examples of simple pulleys;
2. State two applications of pulley machines;
3. Differentiate between fixed and movable pulleys;
4. Construct and use pulleys.