# Lesson Notes By Weeks and Term - Senior Secondary 1

Vectors

Term: 3rd Term

Week: 7

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject:      Physics

Topic:-       Vectors

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

1. Define vectors
2. Explain the addition of vectors

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 reviews the previous lesson on fuse Students pay attention STEP 2 EXPLANATION He defines and explains vectors Students pay attention and participates STEP 3 DEMONSTRATION He explains how to add vectors 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

VECTORS

This is a quantity that has both magnitude and direction. It is typically represented by an arrow whose

direction is the same as that of the quantity and whose length is proportional to the quantity’s magnitude.

For example, displacement, velocity, and acceleration are vector quantities. Vector quantities are often represented by scaled vector diagrams. Vector diagrams depict a vector by use of an arrow drawn to scale in a specific direction.

The magnitude and direction of the vector is clearly labeled. In this case, the diagram shows the magnitude is 20m and the direction is (30 degrees West of North).

There are a variety of methods for determining the magnitude and direction of the result of adding two or more vectors. The two methods that will be discussed in this lesson and used throughout the entire unit are:

1. the Pythagorean theorem and trigonometric methods
1. the head-to-tail method using a scaled vector diagram

To see how the method works, consider the following problem:

Wasiu leaves the base camp and runs 11 km, north and then runs 11 km east. Determine Eric's resulting displacement.

EVALUATION:   1. Define vectors

1. What are the two methods for determining the magnitude and direction of the result of adding two or more vectors?

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively