You and Enegy. Simpe Machine : Lever
Subject : BASIC Science and Technology
Topic : Simple Machine
- Definition of simple machine
- Meaning of a lever
- Samples and Types of lever
- Various parts of a lever
- Different functions and uses of a lever
Class :BASIC 6
Term : Third Term
Week : Week Two
Behavioural Objectives : At the end of the lesson, pupils should be able to
- explain different uses of lever
- recognise various parts of the lever
- give examples of levers that are commonly use around us
Instructional Materials :
1. Lagos State primary school scheme of work
2. Online materials
3. Textbook on Basic science and Technology
Content :
What is a lever?
A level is a simple machine that makes our work easier, faster and less difficult to do.
For any work to be done, force must be applied to do work. A force applied at one point on the device can be used to easily overcome another force at some point in time
Examples of simple machines that can be classified as simple machines are
a) tin opener
B) crow bar
C) plier
The parts of a lever
The three major parts of a lever are
I. The load
II. The effort
III. The fulcrum
Classes of lever
1. First Class Lever eg seesaw, plier, claw, crowbar ete
2. Second class lever eg bottle opener, nutcracker, paper cutter
3. Since humans usually provide energy to levers, “effort” and “load” are often used instead of input and output. Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum.
… Examples of class three levers are forceps, sugar tong, table knives, fishing rod, etc
Uses of lever
1.levers are used to lift heavy objects
2. Levers are used to move heavy objects
Presentation : The topic is presented step by step
Step 1 : The teacher revises the previous topics
Step 2: He introduces the new topic
Step 3: He allows the pupils to give their own examples and gé corrects them ehen the needs arise
Evaluation :
1. What is a simple machine
2. What class of lever is a crowbar
3. Give three examples of first class lever
4. Mention five commonly used lever at home
5. Mention three uses of lever
Conclusion : The class teacher gives a brief note and he goes round to mark
Assignment
1. Read a pulley
2. Mention four uses of pulley
[mediator_tech]