8/7/2019 Skalar n Vector

1/17

1.3 Understanding scalarand vector quantities

8/7/2019 Skalar n Vector

2/17

At the end of this lesson

you will be able to:

Define scalar and vectorquantities

Give examples of scalar and

vector quantities

8/7/2019 Skalar n Vector

3/17

Which team do you think will find the

park first?

Why????

Find a park

located 1 km fromstarting point.

Cari taman yang

letaknya 1km daritempat bermula

Find a park located 1

km from the south ofthe starting point.

Cari taman yang

letaknya 1km ke arah

selatan dari tempatbermula

Team A Team B

N

8/7/2019 Skalar n Vector

4/17

What is scalar quantity?

Scalar quantity is a physical quantity that have

magnitude only.

Kuantiti skalar ialah kuantiti fizik yang

mempunyai magnitud sahaja.

What is vector quantity?

Vector quantity is a physical quantity thathave both magnitude and direction.

Kuantiti vektor ialah kuantiti fizik yang

mempunyai magnitud dan arah.

8/7/2019 Skalar n Vector

5/17

What is distance?

Refers to how much ground an object hascovered.

Merujuk kepada berapa panjang lintasan yang

diambil oleh sesuatu objek.

What is displacement?

Refers to how far an object is from a reference

point.Merujuk kepada jarak sesuatu objek daripada

titik rujukan

8/7/2019 Skalar n Vector

6/17

Scalar Quantity Vector Quantity

Mass/jisim Weight/berat

Time/masa Acceleration/pecutan

Power/kuasa Force/daya

Energy/tenaga Momentum

Temperature/suhu Pressure/tekanan

Density/ketumpatan Impulse/impuls

Speed/laju Velocity/halaju

Distance/jarak Displacement/sesaran

8/7/2019 Skalar n Vector

7/17

Question 1

Scalar quantity are quantities that have

magnitude only

direction onlyboth magnitude and direction

A

CB

8/7/2019 Skalar n Vector

8/17

8/7/2019 Skalar n Vector

9/17

Question 2

Work is a

Vector quantity

Scalar quantityDerive and vector quantity

Derived and scalar quantity

A

D

CB

8/7/2019 Skalar n Vector

10/17

Answer 2

Work is a

Derived and scalar quantityD

8/7/2019 Skalar n Vector

11/17

Question 3

A quantity of X has both magnitude and

direction. Which of the following is possible

quantity of X?

Volume

Power

Acceleration

A

C

B

8/7/2019 Skalar n Vector

12/17

Answer 3

A quantity of X has both magnitude and

direction. Which of the following is possible

quantity of X?

Acceleration

Note : Acceleration is a vector quantity

C

8/7/2019 Skalar n Vector

13/17

Properties of scalars and vectors

Scalar quantity can be summed up by

addition.

When adding vectors, the graphical

method is used to find the magnitude

and the direction.

8/7/2019 Skalar n Vector

14/17

Properties of scalars and vectors

Total distance travelled is

_____ km

Final displacement is

______ km Kuala Lumpur

Kangar

Butterworth 507 km

369 km

138 km

8/7/2019 Skalar n Vector

15/17

Question 1

Chee Wei walks 6 m due west from point Aand then 8 m due south. What is Chee Wei

resultant displacement from A?

8 m9 m

10 m

11 m

A

D

C

B

8/7/2019 Skalar n Vector

16/17

Question 2

Ameer walk to school everyday. He takes routes PQand then QR as shown in figure.

What is distance travelled and the displacement

travelled from house to school everyday?

A

D

C

B

School

House

30 m

40 m

50 mDistance Displacement

50 70

70 50

80 70

90 50

8/7/2019 Skalar n Vector

17/17

Question 3

30 km

Klang

Kuala lumpur Puchong

50 km

What are the

displacement from Klang to

Puchong and

the direction ofKlang from Kuala Lumpur?