# Mechanics: Vector and scalar quantity.

Introduction

Good Day learners I Mr B Mthombeni, today we will be looking at a very interesting topic called Mechanics specifically focusing on vectors and scalar quantities. .

• What are the differences between scalars and vectors?
• What is meant, by position, distance, distance, displacement, speed, velocity and acceleration, and how are these quantities related?
• how do we use graphical methods to represent vectors, displacement, velocity and acceleration?

https://youtu.be/rcDXQ-5H8mk

• Read the following questions carefully
• all solutions must be clearly stated
• the assessment is out of 18 marks.

Question 1

1. Complete the table below, consider each quantity and decide if each quantity is a vector or scalar. Fill in the magnitude and the direction (if any) of each quantity.
 Quantity Vector or scalar? Magnitude Direction 60 km/h (60 kilometres per hour) 23 degrees Celsius 3 steps to the right 3,5 h 100g 34km North 120 km/h South 45cm 220V (220 volts) 1.5A (1.5 amperes) Your weight is 600 N

Question 2

1. Define
1. Scalar   vector
2. Describe how fully we represent a vector graphically.
3. What is the bearing of a vector?
4. Describe how we work with vectors using: head to tail method
5. State how many vectors you can add using a head to tail method.

Explain the meaning of a resultant of two or more vectors

Total mark = 19

Process

To understand vectors and what they represent or mean follow these guidelines.

• read/study the meaning of the difference between vectors and scalar.
• Read on how to represent vectors on a diagram
• describe the difference between a vector and a scalar.
• read or study the properties if vectors: for example, equality of vectors,  negative vectors, multiplication of vectors by scalar, vector addition and subtraction.
• Physical Science text book can be used (Study and master)

Evaluation

This assessment will be evaluated using a rubric below, the rubric is structured to accommodate every detail of the questions given on task.

 Criteria Excellent 5 Good 4 Satisfactory 3 Poor 1-2 Absent 0 Mark Defining vector and scalar quantity Describe how fully we represent a vector graphically Explaining a bearing vector Describe vectors using a head to tail method. State how many vectors can be added? Explain the meaning of a resultant of vectors. Defining the scalar and vector quantity examples, indicate their magnitude and direction. TOTAL /19
Conclusion

congratulations on reaching this final stage of the assessment and lesson. as by now you should be able to:

• differentiate between scalars and vectors
• negative vectors
• drawing the head to tail method of the diagram
• defining the resultant force
• calculating the resultant force

you can follow these links to recap on the work to better understand the concept.

Credits

sources cited for compiling this lesson are:

• Study and master Text book
• the internet

so for the next class we will focus on motion in one direction linking it to the current topic for they work hand in hand.

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