Module 2 Chapter 2 Nature of Quantities

Question 1

Examples of Scalar Quantities

Give 7

Answer 1

Mass, Density, Volume, Distance, Speed, Energy, Power

Question 2

Examples of Vector Quantities

Give 7

Answer 2

Weight, Pressure, Impulse, Displacement, Velocity, Acceleration, Momentum

Question 3

Mass, Scalar or Vector?

+ unit & definition

Answer 3

Scalar
Unit: kg
Definition: The matter content of a body

Question 4

Density, Scalar or Vector?

+ unit & definition

Answer 4

Scalar
Unit: kg m-3
Definition: Mass per unit volume

Question 5

Volume, Scalar or Vector?

+ unit & definition

Answer 5

Scalar
Unit: m3
Definition: Three-dimensional space occupied by a body of matter

Question 6

Distance, Scalar or Vector?

+ unit & definition

Answer 6

Scalar
Unit: m
Definition: Length from one point to another

Question 7

Speed, Scalar or Vector?

+ unit & definition

Answer 7

Scalar
Unit: m s-1
Definition: Distance travelled per unit time

Question 8

Energy, Scalar or Vector?

+ unit & definition

Answer 8

Scalar
Unit: J
Definition: Work done

Question 9

Power, Scalar or Vector?

+ unit & definition

Answer 9

Scalar
Unit: W or J s-1
Definition: Energy converted or work done per unit time

Question 10

Weight, Scalar or Vector?

+ unit & definition

Answer 10

Vector
Unit: N
Definition: Force, acting downwards through a body, due to gravity

Question 11

Pressure, Scalar or Vector?

+ unit & definition

Answer 11

Vector
Unit: Pa or N m-2
Definition: Force per unit area

Question 12

Impulse, Scalar or Vector?

+ unit & definition

Answer 12

Vector
Unit: kg m s-1
Definition: Force * Time

Question 13

Displacement, Scalar or Vector?

+ unit & definition

Answer 13

Vector
Unit: m
Definition: Distance from a specific point in a particular direction

Question 14

Velocity, Scalar or Vector?

+ unit & definition

Answer 14

Vector
Unit: m s-1
Definition: Displacement per unit time

Question 15

Acceleration, Scalar or Vector?

+ unit & definition

Answer 15

Vector
Unit: m s-2
Definition: Change in velocity per unit time

Question 16

Momentum, Scalar or Vector?

+ unit & definition

Answer 16

Vector
Unit: kg m s-1
Definition: Mass * Velocity

Question 17

Scalar Unit

Answer 17

Has just magnitude

Question 18

Vector Unit

Answer 18

Has Magnitude and Direction

Question 19

Scalar Arithmetic

Answer 19

Simply add or subtract the values as appropriate, remembering to convert all values to the same units.

Question 20

Vector Arithmetic

Answer 20

With vectors, direction matters. You may either add and subtract them if the values are parallel, use Pythagoras if the values are perpendicular or use trigonometry in other instances.

Question 21

Acceleration due to gravity

Answer 21

9.81 m s-2