Welcome great EduPodian, here is your Second Term JSS3 Basic Technology Lesson Note excerpt.
Scheme of Work
1. Revision of first term work
2. Mechanical energy transmission system. (a) Friction (b) effects of friction (c) advantages and disadvantages of friction (d) methods of reducing friction (e) belt and chain drive (f) comparison with the gear drive
3. Mechanical energy transmission system.Gear. (i) Gears and gearing systems and related calculations. (ii) types of gears; internal gear, external gear,… (iii) uses of gears; power transmission, changing of direction, for selecting speed(iv) gear ratios and speed ratio (V) friction between meshed gears.
4. Mechanical energy transmission system. Motion (i) linear motion (ii) lever arrangement to produce linear motion (iii) uses of slides and slot in mechanical system (iv) Rotary motion, types of rotary motion – oneway rotary motion and the reversible rotary motion. (v) Conversion of rotary motion to linear motion
5. Mechanical energy transmission system. Airflow. (i) Speed and pressure relationship in air flow. (ii) Variation of air pressure and air speed and their applications. Pneumatics; (i) simple hydraulics and pneumatics devices; simple force pump, double acting pump,… (ii) Compressed air devices, hydraulic jacks, simple garden sprinkler, reaction turbine, water wheel
6. Simple electrical wiring: (a) electrical circuit: series and parallel circuits (b) wiring tools and materials; pliers, hammer, screw driver, clips, wooden blocks, cables, etc. (c) accessories: switches, lamp holders, etc
7. Building (a) foundation (i) definition and function of foundation: support and weight of walls, roofs and inhabitants (ii) foundation types: strip, stepped, raft etc. (iii) types and properties of soil (iv) hand tools and plant for excavation: diggers, shovels, excavator, etc. (b) walls; (i) materials for making walls: grass, zinc, curtain, bricks, etc. (ii) types of walls: walls grass, zinc, curtain bricks etc. (iii) materials for bonding
8. Building (c) floors: (i) floor: basement, ground floor, first floor, etc. (ii) DPC (d) doors, windows and openings (i) Doors: flush door, glazed, sliding, revolving, etc. (ii) windows: louver, sliding, casement, etc (iii) lintel
9. Building (e) Roofs (i) types of roof: flat roof, double pitched, lean-to Gable, etc (ii) roofing materials: grass, zinc, aluminium, etc. (f) simple blue print reading (I) sanitary wares: sink, bath, showers, etc. soak-away, septic tank, socket, windows, doors, room, etc.
10. Practical projects.
Week 1:
Revision of last terms’ work… Click here to order the complete Basic Technology Lesson Note for JSS3 second term
Week 2:
TOPIC: Mechanical Energy Transmission system
Period one: Friction
Content; -Definition of friction
– Nature/characteristics of friction
– Types of frictional force
– Effect of friction
– Advantages of friction
– Disadvantages of friction
– Methods of reducing friction
Definition of friction
Friction can be defined as a force which opposes motion.
It is a force which stops/prevents motion. It acts whenever there is motion or tendency for something to move. i.e friction (or frictional force) is absent if there is no motion or if there is no force intending to cause motion.It stops your car when the brake is applied. It prevents your foot from slipping backward when you walk.
Friction can also be defined as a… Click here to order the complete second term Basic Technology Lesson Note for JSS3
Week 3:
TOPIC: GEAR DRIVE
CONTENT:
– Gear drive
– Seizure
– Types of gears
– Use of gear drive
– Gear ratio
– Speed ratio
– Changing direction of drive
Gear drive
This isa device used to transmit motion between parallel or inclined shafts that are close to each other (such that the tooth on the wheel mounted on the shafts mesh together). When two gears are in mesh, they are called GEAR TRAIN. Friction always occurs between the meshed teeth of the gear train. Constant lubrication is therefore necessary to prevent wearing. The teeth on each gears in mesh must be uniformly spaced around the gear (that is symmetrical) for them to mesh properly and to prevent damage of the tooth. Improperly meshed gears can also lead to seizure of the gear train.
Seizure is the total movement stoppage of the gear train.
Unlike the belt and the chain drive, the driver… Click here to order the complete Lesson Note on Basic Technology JSS3 second term
Week 4:
Get the complete second Term JSS3 Basic Technology Lesson Note
Week 5:
Get the complete JSS3 Lesson Note on Basic Technology second term
Week 6:
Get the complete JSS3 second term Lesson Note on Basic Technology
Week 7:
Get the complete second Term JSS3 Basic Technology Lesson Note
Week 8:
Get the complete lesson for JSS3 Basic Technology second term
Week 9:
Get the complete second term Lesson Note on Basic Technology JSS3
Week 10:
Get the complete second Term JSS3 Basic Technology Lesson Note
Comments