Everything Science Grade 10

20.1 CHAPTER 20. VECTORS AND SCALARS

Exercise 20 - 2

1. Classify the following quantities as scalars or vectors:

a. 12 km

b. 1 m south

c. 2 m·s−^1 , 45 ◦

d. 075 ◦, 2 cm

e. 100 k·h−^1 , 0 ◦

2. Use two different notations to write down the direction of the vector in

each of the following diagrams:

60 ◦

40 ◦

a. b. c.

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(1.) 008s (2.) 008t

Drawing Vectors ESAGM

In order to draw a vector accurately we must represent its magnitude properly and include
a reference direction in the diagram. A scale allows us to translate the length of the arrow
into the vector’s magnitude. For instance if one chooses a scale of 1 cm = 2 N (1 cm
represents 2 N), a force of 20 N towards the East would be represented as an arrow 10 cm
long pointing towards the right. The points of a compass are often used to show direction
or alternatively an arrow pointing in the reference direction.

20 N

Method: Drawing Vectors

1. Decide upon a scale and write it down.

368 Physics: Mechanics