Lesson Notes By Weeks and Term - Junior Secondary 2

Gears 1

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TERM – 3RD TERM

WEEK FOUR

Class: Junior Secondary School 2

Age: 13 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic: GEARS 1

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Define gear
  2. Identify the types of gear
  3. Identify the uses of gear

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS:   Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains the meaning of gear to the students

Students pay

attention

STEP 2

EXPLANATION

Teacher state and discuss the types of gear

Students pay

attention and

participate

STEP 3

DEMONSTRATION

Teacher discusses uses of gear

Students pay

attention and

participate

STEP 4

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

GEARS 1

A gear is a mechanical component with teeth that meshes with another gear's teeth to transmit rotational motion and power. Gears are often used in machinery to change the speed, torque, and direction of mechanical systems. They come in various shapes and sizes, and the arrangement of gears in a system can create different gear ratios, affecting the output motion and force.

Types of gear

There are several types of gears, each designed for specific applications and functions. Common types include:

  1. Spur Gears: Straight-toothed gears that transmit motion between parallel shafts. They are the most common type of gear.
  2. Helical Gears: Similar to spur gears but with angled teeth, providing smoother and quieter operation.
  3. Bevel Gears: Gears with tapered teeth designed to transmit motion between intersecting shafts at right angles.
  4. Worm Gears: A type of gear where a threaded worm meshes with a toothed wheel, providing high gear reduction ratios.
  5. Planetary Gears: Consist of a central "sun" gear, surrounding "planet" gears, and an outer "ring" gear. They offer compact and efficient speed and torque control.
  6. **Internal Gears:** Gears with teeth on the inner surface, used in planetary gear systems.

Uses of gear

Gears are used in a wide range of applications across various industries due to their ability to transmit motion and power efficiently. Common uses include:

  1. Gears are crucial in vehicles for functions like transmission systems, differential gears, and steering mechanisms.
  2. Gears are integral components in machines such as lathes, milling machines, and conveyor systems for transmitting motion and controlling speed.
  3. Gears are used in turbines, generators, and other power generation equipment to convert rotational motion into electrical power.
  4. Gears play a role in aircraft engines, landing gear systems, and various aerospace applications.
  5. Gears are essential in timekeeping devices to control the movement of clock hands and watch mechanisms.
  6. Gears are employed in robotic systems to control the movement of joints and limbs.
  7. Gears in the form of sprockets and chains are used for speed control and power transmission in bicycles and motorcycles.
  8. Gears are utilized in ship propulsion systems, steering mechanisms, and other marine applications.

EVALUATION: 1. What is a gear?

  1. Identify and describe 3 types of gear.
  2. Mention 5 uses of a gear.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively