XPINO SCHOLARS
LESSON PLAN
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WEEK : 2
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TERM : 1
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SESSION : 2017/2018
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SUBJECT: BASIC
TECHNOLOGY
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TOPIC:
MECHANICAL TRANSMISSION SYSTEM: DRIVE
MECHANISM (GEARS AND CHAIN DRIVE)
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CLASS: JS3
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DATE: 25/09/17 –
29/09/17
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LESSON PERIOD: 1 – 2
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Learning Objectives: At the end of the lesson,
the students should be able to:
define drive
mechanism;
describe a gear;
explain how a
gear system differ from pulley mechanism;
state three
things that can be used to transmit energy in drive mechanism;
state the main
difference between belts and chains;
itemise four uses
of belt and chain drives;
mention the names
of four types of belt and pulleys;
Study Questions:
What is a drive
mechanism?
What is a gear?
How does gear
system differ from pulley mechanism?
What three things
can be used to transmit energy in drive mechanism?
What is the main
difference between belts and chains?
What are four
uses of belt and chain drives?
What are the
names of four types of belt and pulleys?
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Key words:
Gear
Pulley
Energy
Belt
Chain
Drive
mechanism
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Instructional materials:
Motor driven
pepper grinder, motor fan belt, sewing machine, bicycles, motor cycle chains,
pictures of chain and belt driven machines, old clock, gear box, etc.
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Previous learning:
The
students can define friction.
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Learning Activities in steps:
Step 1 – Lesson
Introduction.
Step 2 – Teacher
states learning objectives – including study questions. Guide the students to
define drive mechanism. Then, class
discussion on gears. Make good use of instructional materials during the
class discussions.
A drive mechanism is one that takes the power
coming from a motor without any reduction. Gears, chains and belts are
used to transmit energies.
Gears
A gear is a rotating machine part having cut
teeth, which mesh with another toothed part in other to transmit mechanical
energy.
The gear system requires friction. The
friction in the gear system is extremely high hence lubrication is needed at
all times to reduce the friction. The pushing action enables one gear to move
another gear – thereby transferring energy to that gear.
Step 3 – The
Teacher guides the students in differentiating belt and chain drives.
Belt drives and Chain drives
Belts are made of rubber an materials whose
length and nature change with temperature. Examples of belts are motor fan
belts, grinding machine belts, sewing machines. etc.
Chains are made of metals. Common examples are
bicycle and motorcycle chains.
Friction is greatly needed in belt and chain
drives. Belts and chains cannot work when friction is absent. Belts and
chains are used in pulley mechanisms.
Step 4 – Class
Discussion on uses of belt and chain, including
the various types.
Belt and chain drives are used to:
1.
Transmit energy from one
shaft to another when both shafts are separated by a distance greater than
that require for gears.
2.
Change the speed of a pulley.
3.
Change the running direction
of a pulley.
4.
Carry materials as conveyors
from one point to another.
Types of belts and pulleys
1.
Open belt
2.
Crossed belt
3.
V-belt
4.
Chain belt.
Step 5 – Give
the students exercises
Step 6 - Teacher
summarizes and evaluates lesson.
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Learning Timing:
5
minutes
15
minutes
20
minutes
15
minutes
15
minutes
10
minutes
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Differentiation:
Level
1: students that should be able to achieve 80 – 100 %
Level
2: students that should be able to
achieve 60 – 79 %
Level
3: students that should be able to
achieve 50 – 59 %.
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Resources:
Introductory
Technology for Schools and Colleges. Book 1. Evans, pg. 3 – 7
Fundamental
in Basic Technology for Jnr. Sec. Schools Basic 7. Idowu O.C.J. pg. 1 – 5
Sets
Square and Drawing Instruments
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Evaluation:
What is a
drive mechanism?
What is a
gear?
How does
gear system differ from pulley mechanism?
What three
things can be used to transmit energy in drive mechanism?
What is
the main difference between belts and chains?
What are
four uses of belt and chain drives?
What are
the names of four types of belt and pulleys?
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Key Skills:
Listening
skill
Critical
thinking skill
Researching
skill
Problem
solving skill
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Assignment:
What are
the names of four types of belt and pulleys?
What is
the difference between a driving pulley and a driven pulley?
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Name
of Subject Teacher: __________________
Signature:
______________________________
Head
of Department: ______________________
Signature:
______________________________
XPINO SCHOLARS
LESSON PLAN
|
|||||
WEEK : 2
|
TERM : 1
|
SESSION : 2017/2018
|
|||
SUBJECT: BASIC
TECHNOLOGY
|
TOPIC:
MECHANICAL TRANSMISSION SYSTEM: DRIVE
MECHANISM (GEARS AND CHAIN DRIVE)
|
||||
CLASS: JS3
|
DATE: 25/09/17 – 29/09/17
|
LESSON PERIOD: 3
|
|||
Learning Objectives: At the end of the lesson, the
students should be able to:
mention
the names of four types of belt and pulleys;
explain
the difference between a driving pulley and a driven pulley;
Study
Questions:
What are
the names of four types of belt and pulleys?
What is
the difference between a driving pulley and a driven pulley?
|
Key words:
Gear
Pulley
Energy
Belt
Chain
Drive
mechanism
|
||||
Instructional materials:
Motor driven
pepper grinder, motor fan belt, sewing machine, bicycles, motor cycle chains,
pictures of chain and belt driven machines, old clock, gear box, etc.
|
|||||
Previous learning:
The
students can define friction
|
|||||
Learning
Activities in steps:
Step 1 –
Revision of last lesson.
Step 2 – The
Teacher guides the students in a class activity.
Class
activity:
1.
Sketch the four
types of belts and pulleys in your Basic Technology notebook.
2.
Mention six
materials used for making belts.
Step 3 – Class
activity:
1.
How can friction be created?
2.
How can friction be reduced?
3.
What are the advantages of
friction?
4.
What are the disadvantages of
friction?
Step 4 – Give the
students exercises
Step 5 – Teacher
summarizes and evaluates lesson.
|
Learning Timing:
5
minutes
10
minutes
10
minutes
10
minutes
5
minutes
|
||||
Differentiation:
Level
1: students that should be able to achieve 80 – 100 %
Level
2: students that should be able to
achieve 60 – 79 %
Level
3: students that should be able to
achieve 50 – 59 %.
|
Resources:
Introductory Technology for
Schools and Colleges. Book 1. Evans, pg. 3 – 7
Fundamental in Basic Technology
for Jnr. Sec. Schools Basic 7. Idowu O.C.J. pg. 1 – 5
Sets of Mathematical Instrument
Sets Square and Drawing
Instruments
|
|
Evaluation:
What are the
names of four types of belt and pulleys?
What is the
difference between a driving pulley and a driven pulley?
|
Key Skills:
Listening
skill
Critical
thinking skill
Researching
skill
Problem
solving skill
|
|
Assignment:
What is motion?
What are the four
types of motion?
What is the
difference between reciprocating motion and linear motion?
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Name
of Subject Teacher: __________________
Signature:
______________________________
Head
of Department: ______________________
Xpino SCHOLARS is a work tool for teachers and students, but especially for Secondary School Students. Comprehensive lesson notes, with exercises. Past questions in specific subjects for revision and research.
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