# Lesson Notes By Weeks and Term - Senior Secondary 1

Lubrication system

TERM – 2ND TERM

WEEK SEVEN

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: LUBRICATION SYSTEM

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

I.) Define friction

II.) Identify the merits of friction

III.) State the demerits of friction

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 friction to the students Students listens attentively to the teacher STEP 2 EXPLANATION Teacher discuss the merits and demerits of friction. Students exhibit attentiveness and active engagement STEP 3 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

LUBRICATION SYSTEM

Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. It acts parallel to the surfaces and opposes the motion or tendency of motion.

Merits of friction

1. Friction provides the necessary grip between the tires of a vehicle and the road surface, allowing for safe acceleration, deceleration, and cornering.
2. Friction prevents slipping and sliding, providing stability for walking, running, and other forms of locomotion.
3. Friction allows us to control the movement of objects by providing resistance. For example, it enables us to hold objects firmly in our hands and manipulate them with precision.
4. Friction is crucial in various engineering applications, such as brakes, clutches, and fasteners, where controlled friction is necessary for proper functioning.

Demerits of friction

1. Friction results in the conversion of kinetic energy into heat energy, leading to energy loss in mechanical systems. This energy loss can reduce the efficiency of machines and systems.
2. Friction between moving parts can cause wear and tear over time, leading to the need for maintenance and replacement of components.
3. Friction opposes motion, so it can limit the maximum speed achievable by vehicles and other moving objects.
4. In some cases, friction can produce undesirable effects, such as noise and vibration, which can be problematic in precision machinery and equipment.

EVALUATION: 1. Define friction

1. Mention 4 merits of friction
2. Mention 4 demerits of friction

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively