__Scalar Quantity:__

1.
A

**scalar**quantity has**magnitude only**(e.g. distance travelled – 1 km).

2.

(Note:

**Final scalar quantities**can be found by**simple****additions and subtractions**of**like scalar quantities involved.**(Note:

**Pressure**is a**scalar quantity**)__Vector Quantity__

1.
A

**vector**quantity has both**magnitude**and**direction**(e.g. displacement – 1 km due East).

2.

**Resultant vector quantities**can be found by**graphical methods**to account for the magnitudes and directions of each individual like vector quantities involved.
3.

**Vector**variables (e.g. displacement,**s**) are written**in bold**.

4.

__Examples of Scalar & Vector Quantities:__

__Scalar Quantities__

__Vector Quantities__
Length Displacement

Mass Weight (m

**g**)
Time Acceleration; Gravitational
Acceleration,

**g;**
Temperature Momentum; Impulse

Current Force; Impulsive Force;
Gravitational Force

Speed Velocity

Area

Volume

Density

Energy

Work

Power

**Pressure (acts in all directions in fluids)**

**Which one is a vector quantity?**

**2007 P1 Q2 pg. 92**: A Energy; B Power; C Force; D Pressure? (Answer:: C)

**2009 P1 Q2 pg 186**: A Area; B Length; C Distance; D Displacement? (Answer: D)

__2012 P1 Q3 pg. 332__: A Energy; B Force; C Mass; D Speed? (Answer: B)

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__Segment Review Questions:__A)

__Scalar Quantity and Vector Quantity__

1.
State the main difference between a scalar quantity and
a vector quantity.

2.
An object moves 40 km on a bearing of 090 from O to A in
20 minutes; it then immediately moves north 30 km also in 20 minutes to B. Find:

a.
The total distance travelled by the object from O to B

b.
The final displacement of the object in moving from O
to B in terms of both magnitude and bearing from O.

c.
For the whole journey from O to B:

i.
The object’s average speed

ii.
The object’s average velocity

3.
Is pressure a scalar or vector quantity? Name 5 scalar
quantities.

4.
Name 5 vector quantities and state their respective SI units
of measurement.

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Updated on 24/01/2013 by tutortan1@gmail.com

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