Listed below are various physical quantities. Classify them into two.

1. Acceleration 2. Time

3. Temperature 4. Velocity

5. Mass6. Distance7. Pressure

8. Force9. Density

What did you consider in classifying the given

quantities?

1st possible answer

Fundamental Derived

2. Time 1. Acceleration

3. Temperature 4. Velocity

5. Mass 7. Pressure

6. Distance 8. Force

9. Density

Correct Answer

Scalar Vector

2. Time 1. Acceleration

3. Temperature 4. Velocity

5. Mass 7. Pressure

6. Distance 8. Force

9. Density

SCALAR AND VECTOR QUANTITIES

VECTORS

I was a SCALAR until you walked into my life. Now, I am a VECTOR!

SCALAR QUANTITIES

Comes from the Latin word “scala” meaning steps or ladder

Those that can be described by magnitudes and appropriate units

Examples: mass, temperature, speed, time, work, energy and distance

VECTOR QUANTITIES

Originates from the word “vehere” meaning to carry

Those that are described by magnitudes, appropriate units and directions

Examples: Force, displacement, velocity, acceleration, momentum and torque

VECTOR REPRESENTATIONA vector quantity is represented by an

arrow (Ex. A )It can also be represented by boldface

type (Ex. A)The tail indicates the starting point of

the vectorThe arrowhead shows direction

Example of Vectors

A displacement of D, of 15 km to the East

Scale: 1cm: 3km

3km 6km 9km 12km

15km

Example #2

Scale: 1cm: 10 units

Practice Exercise

40 newtons SE15 m/s 25 degrees SW120 km E 35 degrees S

ActivityThink-pair-shareRepresent the following vectors graphically:

scale (1unit = 20 units)100 N, 25º N of E50 m, south80 m/s, 60º W of N110 N, 35º S of W90 m/s², 30º S of E

Generalization1. What are vectors?2. What are the important parts of a vector arrow?

3. How are vectors represented?

Homework

Bring the following:1. Ruler2. Protractor3. Graphing paper

END